feat(bigguery): add url.domain to span tracing

[ldetmer]

This adds the url.domain attribute to http span tracing. This field should matching the proto domain if not overridden by user, otherwise it should match the user set value.

default domain
user set example

[gemini-code-assist]

Summary of Changes

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This pull request enhances the OpenTelemetry tracing capabilities within the BigQuery client library by introducing the url.domain attribute to HTTP spans. This addition provides valuable context for understanding the network interactions of BigQuery RPCs, making it easier to diagnose and monitor service calls, whether they target the default BigQuery endpoint or a custom one.

Highlights

• OpenTelemetry Tracing Enhancement: The url.domain attribute has been added to HTTP span tracing for BigQuery RPC calls, providing more detailed context about the service endpoint.
• Domain Resolution Logic: The url.domain will reflect the default BigQuery API host or a user-specified host if overridden, ensuring accurate domain information in traces.
• Test Coverage: New unit tests were introduced to validate the correct capture and reporting of the url.domain attribute under both default and custom host configurations.

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[gemini-code-assist]

Code Review

This pull request enhances BigQuery RPC tracing by introducing a new url.domain telemetry attribute. The HttpBigQueryRpc class now captures the domain from the resolved API host and attaches it to OpenTelemetry spans. The changes include adding a urlDomain field, initializing it in the constructor, and updating the BigQueryTelemetryTracer to define and use this new attribute. Unit tests have been added to verify the url.domain attribute for both default and custom host configurations. A review comment points out a potential issue where GenericUrl.getHost() could return null if the host lacks a scheme, leading to the silent omission of the url.domain attribute, suggesting improved validation or the use of java.net.URI for robustness.