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MINOR: [Go] Add "IsSignedInteger" (#35050)



### Rationale for this change
Return true, if data type is signed integer(int8, int16, int32, int64).

### What changes are included in this PR?
Implementation "IsSignedInteger"

### Are these changes tested?
No

### Are there any user-facing changes?
Yes

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