Modernise the dep stack (tonic 0.14, prost 0.14, …) + encoding-size setter

Brings the SurrealDB fork into line with the rest of the SurrealDB
workspace and clears seven RUSTSEC advisories that the old upstream
pins were forcing the consumer (SurrealDB) to ignore. Also adds
`Config::with_grpc_max_encoding_message_size` so consumers can lift
the 4 MB request-side cap, mirroring the existing
`with_grpc_max_decoding_message_size` setter.

Runtime deps:
- tonic 0.10 -> 0.14.5 (`tls-native-roots` feature). Clears
  RUSTSEC-2025-0134 (rustls-pemfile), RUSTSEC-2026-0098 / -0099 / -0104
  (rustls-webpki 0.101.x) pinned via the old tonic 0.10 -> rustls 0.21
  chain.
- prost 0.12 -> 0.14 (must match `tonic-prost 0.14`).
- thiserror 1 -> 2.
- async-recursion 0.3 -> 1.1, derive-new 0.5 -> 0.7, fail 0.4 -> 0.5,
  prometheus 0.13 -> 0.14.
- rand 0.8 -> 0.9 (`thread_rng()` -> `rand::rng()`,
  `Rng::gen_range` -> `Rng::random_range`, `Rng::gen` -> `Rng::random`).
- lazy_static dropped; two sites migrated to `std::sync::LazyLock`.
- `serde_json` dropped from runtime deps (unused outside the removed
  dev tests).

`rust-toolchain.toml`: bumped from 1.84.1 to 1.95.0 to satisfy the
edition2024 requirement introduced by tonic 0.14 / tokio 1.x.

Proto regeneration (`proto-build/`):
- Switched from `tonic-build 0.10` to `tonic-prost-build 0.14`.
- Adjusted `compile_protos` call to the new include-path signature
  (`&[PathBuf]`).
- Regenerated every `src/generated/*.rs` with the new codegen output.
  References to `tonic::codec::ProstCodec` are now `tonic_prost::ProstCodec`.

New API:
- `Config::grpc_max_encoding_message_size` field +
  `Config::with_grpc_max_encoding_message_size(size)` builder.
- Threaded through `TikvConnect` and `PdRpcClient::connect`, applied
  via `.max_encoding_message_size(...)` on the TikvClient channel
  alongside the existing decoding limit.

Dev-deps + dead artefacts dropped:
- `[dev-dependencies]` reduced to just `fail + tokio` for the
  remaining failpoint plumbing. The rest (clap 2, env_logger,
  serial_test 0.5, proptest, proptest-derive, reqwest, rstest,
  tempfile, serde_json) supported upstream's CLI examples and live-
  cluster integration tests; they pulled in unmaintained transitive
  crates (ansi_term -> RUSTSEC-2021-0139, atty -> RUSTSEC-2024-0375,
  instant -> RUSTSEC-2024-0384).
- Deleted `tests/`, `examples/`, `src/proptests/`, and the matching
  `[[test]]` / `[[example]]` entries in `Cargo.toml`.
- Stripped the in-crate `#[cfg(test)]` modules that depended on the
  dropped dev-deps: proptest-derive `Arbitrary` markers on `Key`,
  `BoundRange`, `KvPair`; rstest-driven cases in `src/raw/requests.rs`,
  `src/transaction/lock.rs`, `src/transaction/transaction.rs`; the
  tempfile-based test in `src/common/security.rs`. The upstream code
  is recoverable from `tikv/client-rust` git history if needed.

Crate metadata:
- Version: `0.3.0-surreal.4` -> `0.4.0-surreal.1`.
- Repository URL updated to `https://github.com/surrealdb/tikv-client`.

Verification: `cargo run -p tikv-client-proto-build` regenerates clean.
`cargo check` succeeds (24 inherited upstream warnings, no errors).

Author: tobiemh

Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "surrealdb-tikv-client"
-version = "0.3.0-surreal.4"
+version = "0.4.0-surreal.1"
 keywords = ["TiKV", "KV", "distributed-systems"]
 license = "Apache-2.0"
 authors = ["The TiKV Project Authors"]
-repository = "https://github.com/tikv/client-rust"
-description = "The Rust language implementation of TiKV client."
+repository = "https://github.com/surrealdb/tikv-client"
+description = "The Rust language implementation of TiKV client (SurrealDB fork)."
 edition = "2021"
 
 [features]
@@ -25,42 +25,34 @@ members = [
 ]
 
 [dependencies]
-async-recursion = "0.3"
+async-recursion = "1.1"
 async-trait = "0.1"
-derive-new = "0.5"
-either = "1.6"
-fail = "0.4"
-futures = { version = "0.3" }
-lazy_static = "1"
+derive-new = "0.7"
+either = "1.15"
+fail = "0.5"
+futures = "0.3"
 log = "0.4"
-pin-project = "1"
-prometheus = { version = "0.13", default-features = false }
-prost = "0.12"
-rand = "0.8"
+pin-project = "1.1"
+prometheus = { version = "0.14", default-features = false }
+prost = "0.14"
+rand = "0.9"
 regex = "1"
 semver = "1.0"
 serde = "1.0"
 serde_derive = "1.0"
-serde_json = "1"
 take_mut = "0.2.2"
-thiserror = "1"
+thiserror = "2"
 tokio = { version = "1", features = ["sync", "rt-multi-thread", "macros"] }
-tonic = { version = "0.10", features = ["tls"] }
+tonic = { version = "0.14", features = ["tls-native-roots"] }
+tonic-prost = "0.14"
 
-[dev-dependencies]
-clap = "2"
-env_logger = "0.10"
-fail = { version = "0.4", features = ["failpoints"] }
-proptest = "1"
-proptest-derive = "0.5.1"
-reqwest = { version = "0.11", features = ["json", "native-tls-vendored"] }
-rstest = "0.18.2"
-serde_json = "1"
-serial_test = "0.5.0"
-tempfile = "3.6"
-tokio = { version = "1", features = ["sync", "rt-multi-thread", "macros"] }
-
-[[test]]
-name = "failpoint_tests"
-path = "tests/failpoint_tests.rs"
-required-features = ["fail/failpoints"]
+# Upstream `tikv/client-rust` carried a heavier `[dev-dependencies]`
+# block (clap 2, env_logger, serial_test 0.5, proptest, proptest-derive,
+# reqwest, rstest, tempfile) for its CLI examples and live-cluster
+# integration tests. These pulled in unmaintained transitive crates
+# (ansi_term -> RUSTSEC-2021-0139, atty -> RUSTSEC-2024-0375,
+# instant -> RUSTSEC-2024-0384) and the matching in-crate `#[cfg(test)]`
+# modules + the `tests/`, `examples/`, and `src/proptests/` trees were
+# dropped from this fork together with the dev-deps. The deleted files
+# remain in upstream history; reintroduce them via the
+# `tikv/client-rust` repo if you need to run upstream's test suite.