docs: update Python SDK docs for releases v0.9.0–v1.0.2

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Updates Python SDK documentation to cover user-facing features shipped across the v0.9.0–v1.0.2 release series.

New features documented:

• Signals (v1.0.0): New ctx.signal / ctx.resolve_signal / ctx.reject_signal API that lets any invocation wait for a named signal from any other handler. Added a dedicated section with examples to external-events.mdx. Requires restate-server 1.7 with protocol v7 enabled.
• TerminalError metadata (v1.0.0): TerminalError now accepts an optional metadata dict to attach structured, machine-readable context to terminal failures. Documented with example in error-handling.mdx.
• Replay-aware logging (v0.9.0): New restate.getLogger() and restate.RestateLoggingFilter suppress duplicate log output during handler replays. Added a new logging.mdx page (with nav entry in docs.json).
• Named sleeps (v0.11.0): ctx.sleep now accepts an optional name parameter visible in the Restate UI. Added to durable-timers.mdx.
• Invocation context managers (v0.13.0): Handlers can declare invocation_context_managers to set up and tear down resources (connections, spans, DI) per attempt. Documented with example in services.mdx.
• pytest fixture harness and typed client (v0.12.0): restate.create_test_harness as an async context manager for pytest fixtures, with the typed SDK client for calling handlers directly. Updated testing.mdx to cover both the sync and async harness patterns, plus always_replay / disable_retries flags (v0.9.1).

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