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GH-36568: [Go] Include Timestamp Zone in ValueStr (#36569)



### Rationale for this change
While trying to fix an issue with Snowflake ADBC timestamp handling, I came across this as part of the problem.

### What changes are included in this PR?
Adds the timezone string indicator to the output of `ValueStr` for a timestamp array.

* Closes: #36568

Authored-by: Matt Topol <zotthewizard@gmail.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>