geo/geomfn: implement ST_Translate({geometry, float8,float8,float8})

Jesse Seldess (jseldess) commented:


PR: https://github.com/cockroachdb/cockroach/pull/68959

From release notes:
> Implemented the geometry-based [builtin](../v21.2/functions-and-operators.html#built-in-functions] `ST_Translate` on arguments `{geometry, float8,float8,float8}`. [#68959][#68959)

Jira Issue: DOC-1382