Ask Bjørn Hansen fc3617b7d8 feat(tracing): add bearer token authentication for OTLP exporters ...

Add BearerTokenFunc to support dynamic bearer token authentication
for OTLP gRPC exporters. Tokens are injected via gRPC PerRPCCredentials
on each export request.

- Add BearerTokenFunc type and Config field in tracerconfig
- Implement bearerCredentials (gRPC) and bearerRoundTripper (HTTP)
- Wire bearer auth into all three gRPC exporter creation functions
- Add token verification before flushing buffered logs
- Fix race condition in buffering exporter initialization

Note: HTTP exporters don't support dynamic bearer tokens due to
OpenTelemetry SDK limitations (no WithHTTPClient option). Use gRPC
protocol for dynamic tokens.

2025-12-27 12:52:37 -08:00

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