SNOW-1501890 Implement structured maps

[sfc-gh-pfus]

Description

SNOW-1501890 Implemented structured maps

Checklist

• [ ] Created tests which fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.35671% with 108 lines in your changes missing coverage. Please review.

Project coverage is 83.01%. Comparing base (20f611f) to head (6a4010f).

Files	Patch %	Lines
converter.go	83.69%	60 Missing :warning:
structured_type.go	61.06%	44 Missing :warning:
datetime.go	60.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1171 +/- ## ========================================== - Coverage 83.16% 83.01% -0.16% ========================================== Files 54 54 Lines 12149 12578 +429 ========================================== + Hits 10104 10441 +337 - Misses 2045 2137 +92 ```

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