Implement IndexTags

[austin-denoble]

Problem

Index tags are a feature which was included in the 2024-10 API specification, but was not implemented in the SDK interface.

Solution

• Add new IndexTags type to models.go. This just represents map[string]string, lining up with the generated type.
• Update CreateServerlessIndexRequest, CreatePodIndexRequest, and ConfigureIndexParams to allow passing IndexTags optionally.
• Update integration test setup / teardown to support working with tags. Add a new test method to exercise validating tags, and updating them through ConfigureIndex.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

CI Integration Tests should pass - these create serverless & pod indexes with tags, and then a test checks the tags and updates them as a part of the integration test suite.

To work with tags directly in Go:

	indexTags := IndexTags{"test1": "test-tag-1", "test2": "test-tag-2"}
	serverlessIdx, err := in.CreateServerlessIndex(ctx, &CreateServerlessIndexRequest{
		Name:      "test-index",
		Dimension: uint32(5),
		Metric:    Cosine,
		Region:    "us-east-1",
		Cloud:     "aws",
		Tags:      &indexTags,
	})

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