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GH-36935: [Go] Fix Timestamp to Time dates (#36964)



### Rationale for this change
The previous solution converted everything to nanoseconds first but you end up with overflowing `int64` potentially. Since we've bumped the minimum version of the library to using go1.17+ we can use the newer `UnixMicro` and `UnixMilli` functions to make this easy.

### Are these changes tested?
Yes, unit test is added.

* Closes: #36935

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