Refactor issue type handling

[tembo-darren]

Summary

Refactored issue type handling to use only two canonical handler types: query (read operations) and mutation (write operations). Removed legacy HTTP method-specific types (get, post, put, delete, patch) from the enum while maintaining backwards compatibility through mapping.

Key Changes

Rust Codegen (rapid-web-codegen)

• Simplified RouteHandler enum to only Query and Mutation variants
• Updated handler parsing to map legacy HTTP methods to canonical types
• Replaced verbose if-else chains with loop-based validation using VALID_HANDLER_NAMES constant
• Improved error handling with unreachable!() for invalid handler types

Rust Web (rapid-web)

• Removed individual HandlerRequestType variants for HTTP methods
• Added HandlerRequestType::from_function_name() for parsing with deprecation warnings
• Added HandlerRequestType::as_str() for canonical string representation
• Updated type generation to use the new methods instead of match expressions
• Changed default handler type from "get" to "query"

TypeScript Client (rapid-react)

• Simplified SupportedHTTPMethods type to only 'query' | 'mutation'
• Extracted URL resolution logic into resolveUrl() helper function
• Consolidated switch cases: 'query' and 'mutation' now handle all HTTP methods
• Removed individual type definitions for legacy HTTP methods
• Updated test fixtures to use canonical types

Documentation

• Added comprehensive comments explaining the canonical types and deprecation path
• Clarified that legacy names are accepted for backwards compatibility but emit warnings
• Documented the mapping: query/get → Query, mutation/post/put/delete/patch → Mutation

Want tembo to make any changes? Add a review or comment with @tembo and i'll get back to work!

[tembo-darren]

Requesting review from @DarrenBaldwin07 who has experience with the following files modified in this PR:

• crates/rapid-web/src/util.rs
• packages/rapid-react/src/bolt.ts
• packages/rapid-react/src/types.ts
• crates/rapid-web/src/shift/util.rs
• crates/rapid-web-codegen/src/lib.rs
• crates/rapid-web-codegen/src/utils.rs
• crates/rapid-web/src/shift/generate.rs
• packages/rapid-react/src/__tests__/bolt.test.ts