Adding autoservice annotations to all SchemaTransformProviders

[pabloem]

oops ^^'

r: @johnjcasey

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[pabloem]

Run Java_GCP_IO_Direct PreCommit

[damondouglas]

@pabloem LGTM

[pabloem]

Run Java_GCP_IO_Direct PreCommit

[pabloem]

Run Java_GCP_IO_Direct PreCommit