SNOW-1256899 Add structured types docs

[sfc-gh-pfus]

Description

SNOW-1256899 Added docs of structured types usage.

Checklist

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.39%. Comparing base (0389a9a) to head (75fc235).

:exclamation: Current head 75fc235 differs from pull request most recent head e86573a. Consider uploading reports for the commit e86573a to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1124 +/- ## ======================================= Coverage 75.39% 75.39% ======================================= Files 53 53 Lines 11245 11245 ======================================= Hits 8478 8478 Misses 2767 2767 ```

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