chore: Add gcp resource name span attribute

[surbhigarg92]

Adding a new span attribute called gcp.resource.name which contains an identifier to a particular spanner instance and database in the following format:

//spanner.googleapis.com/projects/{project}/instances/{instance_id}/databases/{database_id}
Example:

//spanner.googleapis.com/projects/my_project/instances/my_instance/databases/my_database

[gemini-code-assist]

Summary of Changes

Hello @surbhigarg92, 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 observability for Google Cloud Spanner by introducing a new "gcp.resource.name" attribute to OpenTelemetry spans. This attribute provides a standardized, fully qualified resource identifier for Spanner instances and databases, making it easier to trace and monitor specific resources within distributed systems.

Highlights

• New Span Attribute: Introduces a new OpenTelemetry span attribute, "gcp.resource.name", to provide a unique identifier for Google Cloud Spanner instances and databases.
• Resource Name Format: The "gcp.resource.name" attribute is formatted as a full resource path, e.g., "//spanner.googleapis.com/projects/{project}/instances/{instance_id}/databases/{database_id}".
• Test Coverage: Adds a new test assertion to "OpenTelemetrySpanTest" to ensure the "gcp.resource.name" attribute is correctly set and verified in generated spans.

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[gemini-code-assist]

Code Review

This pull request adds a new span attribute gcp.resource.name to traces, which is a great addition for resource identification in GCP. The implementation looks correct and follows the format specified in the description. I've added a couple of suggestions to improve code maintainability by reducing magic strings in both the implementation and the test.