fix(auth): add InternalOptions.TelemetryAttributes for internal client use

[quartzmo]

refs: googleapis/google-api-go-client#3442

[gemini-code-assist]

Summary of Changes

Hello @quartzmo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the internal client options by adding a mechanism to attach static telemetry attributes to OpenTelemetry signals. This change aims to improve the observability of internal client operations by providing consistent identification across various telemetry data, such as traces and metrics, without affecting external API consumers.

Highlights

• New TelemetryAttributes Field: Introduced a new TelemetryAttributes field of type map[string]string to the InternalOptions struct in both gRPC and HTTP transport packages.
• OpenTelemetry Integration: This new field allows internal clients to specify telemetry attributes for OpenTelemetry signals (tracing and metrics), ensuring consistent static identity across these signals for enhanced observability.
• Internal Use Only: The TelemetryAttributes field is explicitly marked for internal use by generated clients, similar to other fields within InternalOptions.

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[gemini-code-assist]

Code Review

This pull request introduces a new field TelemetryAttributes to the InternalOptions struct in both grpctransport and httptransport packages. This change allows internal clients to specify telemetry attributes for OpenTelemetry signals. The implementation is straightforward and correct, adding the field and its corresponding documentation. The changes are consistent across both packages and follow Go conventions. I've added a couple of suggestions to improve the documentation for this new field to clarify ownership of the map and prevent potential misuse, given that maps are reference types.