wboayue / realflight-bridge / #34

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feat: add async bridge support with Tokio runtime (#36)

* feat: add async bridge support with Tokio runtime

Add optional async bridge support via `rt-tokio` feature flag:
- AsyncBridge trait mirroring sync RealFlightBridge
- AsyncLocalBridge with builder pattern for configuration
- AsyncRemoteBridge for remote simulator connections
- AsyncProxyServer with CancellationToken for graceful shutdown
- AsyncConnectionPool using tokio channels
- AsyncTcpSoapClient for async SOAP requests
- AsyncStubSoapClient for testing

* docs: add async usage examples to README

* chore: bump version to 1.0.0, update docs for uom feature

* fix: replace deprecated criterion::black_box with std::hint::black_box

* bench: add encode_control_inputs benchmark

Exposes encode_control_inputs via bench-internals feature to benchmark
the hot path encoding alongside existing decode benchmarks.

* test: add comprehensive tests for async bridge implementations

- Add request tracking to AsyncStubSoapClient
- Add 19 tests for AsyncLocalBridge (builder, operations, exchange_data)
- Add 8 tests for AsyncRemoteBridge (operations, error handling)
- Add 10 tests for AsyncProxyServer (routing, cancellation, disconnect)
- Add 4 tests for AsyncConnectionPool (valid stream, replenish, drop)
- Add 5 tests for AsyncTcpSoapClient (parsing, stats)
- Refactor AsyncProxyServer with run_with_bridge() for testability

* fix: replace curly apostrophe with straight apostrophe

* fix: address PR review findings #2, #3, #4

- #2: send_request takes Option<&ControlInputs>, clones internally
- #3: stub_async uses tokio::sync::Mutex, async queue_response/requests
- #4: pool_async uses watch channel for init error reporting
- docs: fix double backtick typo in enable_rc doc

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