Add UUID support in SpannerSchema

[lagarwal1]

Add support for UUID in SpannerSchema.Column class. This is needed to support UUID in Teleport.
R: @darshan-sj

[darshan-sj]

@Abacn Please review

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[darshan-sj]

assign set of reviewers

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R: @kennknowles for label java.
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R: @nielm for label spanner.

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[Abacn]

org.apache.beam.sdk.io.gcp.bigquery.StorageApiSinkSchemaUpdateIT > testExactlyOnceWithAutoSchemaUpdate[1] FAILED not related to this change.

Going to merge once tests end. Thanks!