feat(bigquery): add table resource tags support

[shollyman]

This PR adds support for resource tags on BigQuery tables.

Due to the nature of the feature, testing necessitates special provisioning with resourcemanager to establish a parent with the proper keys and values defined, which can then be bound to the table.

While implementing, testing was done in a personal test project, with the following commands to establish the necessary tags/values:

gcloud resource-manager tags keys create test_tag_key --parent=projects/shollyman-testing

gcloud resource-manager tags values create COFFEE --parent=tagKeys/281483438148747
gcloud resource-manager tags values create TEA --parent=tagKeys/281483438148747
gcloud resource-manager tags values create WATER --parent=tagKeys/281483438148747

This integration test was used to smoke test that the feature works:

func TestIntegration_TableResourceTags(t *testing.T) {
	if client == nil {
		t.Skip("Integration tests skipped")
	}

	testKey := "shollyman-testing/test_tag_key"

	ctx := context.Background()
	table := dataset.Table(tableIDs.New())
	resourceTags := map[string]string{
		testKey: "COFFEE",
	}
	if err := table.Create(context.Background(), &TableMetadata{
		Schema:       schema,
		ResourceTags: resourceTags,
	}); err != nil {
		t.Fatalf("table.Create: %v", err)
	}
	defer table.Delete(ctx)
	md, err := table.Metadata(ctx)
	if err != nil {
		t.Fatalf("table.Metadata: %v", err)
	}

	var found bool
	for k, v := range md.ResourceTags {
		if k == testKey && v == "COFFEE" {
			found = true
			break
		}
	}
	if !found {
		t.Errorf("tag key/value not found")
	}

	updatedTags := map[string]string{
		testKey: "COFFEE",
	}
	// Update table DefaultCollation to case-sensitive
	updated, err := table.Update(ctx, TableMetadataToUpdate{
		ResourceTags: updatedTags,
	}, md.ETag)
	if err != nil {
		t.Fatalf("table.Update: %v", err)
	}

	found = false
	for k, v := range updated.ResourceTags {
		if k == testKey && v == "COFFEE" {
			found = true
			break
		}
	}
	if !found {
		t.Errorf("tag key/value not found")
	}

}

I've removed the integration test for the time being after verification, given the complexity of the setup outside of the BQ service.