Add AWS Lambda support and OTel plugin

[eamsden]

Summary

• Add Rust AWS Lambda worker support with deadline-aware graceful shutdown, configuration loading, worker versioning, and shutdown hooks.
• Add an AWS Lambda OpenTelemetry plugin with ADOT defaults, OTLP metrics/tracing, and warm-invocation-safe flushing.
• Keep aws-lambda and aws-lambda-otel as independent opt-in features. Lambda runtime dependencies are enabled only by aws-lambda; AWS-specific OTel support is enabled only by aws-lambda-otel, while generic otel remains AWS-free.
• Add the post-Core-shutdown interceptor lifecycle hook and non-destructive OTel force-flush support.
• Fix host-side WASM example linking while preserving standalone component builds.

Verification

• cargo test -p temporalio-sdk --no-default-features — 38 passed
• cargo test -p temporalio-sdk --no-default-features --features aws-lambda — 47 passed
• cargo test -p temporalio-sdk --no-default-features --features aws-lambda-otel — 42 passed
• cargo test -p temporalio-sdk --no-default-features --features aws-lambda aws-lambda-otel — 51 passed
• cargo integ-test -t wasm_workflow_tests — 8 passed
• cargo lint
• cargo test-lint
• cargo +nightly fmt --all --check
• Standalone WASM component build — passed offline

Known limitations

• No live AWS Lambda/ADOT deployment test was run.
• Rust OTel context propagation through Temporal headers remains outside this change.

[brucearctor]

is there an associated issue with this work?