feat: grpc instrumentation for outbound requests

[sohankshirsagar]

Notable changes

• Added grpc instrumentation for outbound requests
  • The instrumentation code for grpc inbound (server) requests is commented out
    • It is functional, but still need to test more
    • This will require more changes to replay grpc inbound requests
• Replaced NodeSDK with NodeTracerProvider
  • Changed from using OpenTelemetry's NodeSDK to NodeTracerProvider to avoid importing the @grpc/grpc-js package, which was interfering with our gRPC instrumentation
• Removed unused packages from package.json

---

Note

Adds outbound gRPC (@grpc/grpc-js) instrumentation with tests/docs and switches tracing from NodeSDK to NodeTracerProvider.

• Instrumentation (gRPC):
  • Add GrpcInstrumentation for outbound client calls (@grpc/grpc-js), including metadata/payload (Buffer) serialization utilities and types.
  • New integration tests and E2E test apps (CJS/ESM), proto files, and example server/clients; grpc-server added to docker-compose.test.yml.
  • Add grpc to exported libraries and module name list.
• Tracing/Core:
  • Replace OpenTelemetry NodeSDK with NodeTracerProvider + BatchSpanProcessor and Resource/service.name; initialize tracing after registering instrumentations; register GrpcInstrumentation.
• CI/Docs:
  • CI: use npm ci in test workflow; add postinstall script for patch-package.
  • README: list GRPC support; CONTRIBUTING/E2E guide tidy-ups.
• Dependencies:
  • Swap @opentelemetry/sdk-node/instrumentation packages for @opentelemetry/sdk-trace-node/resources; add dev deps @grpc/grpc-js and @grpc/proto-loader; remove unused protobuf-related deps.

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