SNOW-1524221 handle nested arrays

[sfc-gh-astachowski]

Description

SNOW-1524221 Added handling of N-dimensional arrays for N>2 to stringToValue

Checklist

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

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.16%. Comparing base (52590b9) to head (112ffe8). Report is 2 commits behind head on master.

Files	Patch %	Lines
converter.go	77.77%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1176 +/- ## ========================================== - Coverage 83.16% 83.16% -0.01% ========================================== Files 54 54 Lines 12149 12158 +9 ========================================== + Hits 10104 10111 +7 - Misses 2045 2047 +2 ```

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[sfc-gh-astachowski]

I have read the CLA Document and I hereby sign the CLA

[sfc-gh-astachowski]

recheck