feat(bigtable): Add support for creating Instance with tags

[dohun-dev]

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[gemini-code-assist]

Summary of Changes

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This pull request enhances the Bigtable client library by adding support for creating instances with associated tags. It modifies the configuration structures and instance creation methods to include a Tags map, allowing users to specify resource tags. The changes ensure that the client can correctly pass tag information to the Bigtable service, improving resource management and organization capabilities for Bigtable instances.

Highlights

• New Feature: Instance Tagging: Introduced a new Tags field to the InstanceConf and InstanceWithClustersConfig structs, enabling the association of TagKey and TagValue resource names with Bigtable instances during creation.
• API Integration: The CreateInstance and CreateInstanceWithClusters methods in bigtable/admin.go have been updated to accept and pass the new Tags field to the underlying Bigtable API.
• Test Coverage: A new test case, TestInstanceAdmin_CreateInstance_WithTags, has been added to bigtable/admin_test.go to ensure that instances can be created with tags without errors. It notes that direct verification of tag persistence is not possible through instance metadata.

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[gemini-code-assist]

Code Review

This pull request adds support for specifying tags when creating a Bigtable instance. The changes correctly plumb the Tags field through the InstanceConf, InstanceWithClustersConfig, and finally to the API request. A new test is also added to cover this functionality. My review includes one point of feedback on the new test, where the key and value for the tags map appear to be inverted compared to the field's documentation.