Adding support for pg Jsonb datatype in SpannerIO

[darshan-sj]

fixes #29312
Adding support for pg Jsonb datatype in SpannerIO

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[darshan-sj]

@nielm Please review.

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[darshan-sj]

Run Java_GCP_IO_Direct PreCommit

[nielm]

LGTM

[darshan-sj]

Run Java_GCP_IO_Direct PreCommit

[darshan-sj]

@pabloem Can you please help to merge this PR?

[darshan-sj]

One of the checks failed and another one is not starting. I'm not able to restart them.

[Abacn]

nvm jenkins has been down for a while