SNOW-871115: add geometry support

[sfc-gh-aling]

Please answer these questions before submitting your pull requests. Thanks!

1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SNOW-871115

echoing PR #427 with a couple of more changes

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
   • I am adding new logging messages
   • I am adding new credentials
   • I am adding a new dependency

3. Please describe how your code solves the related issue.

   Please write a short description of how your code change solves the related issue.

[codecov]

Codecov Report

Merging #429 (9b305d1) into main (e3f675e) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
+ Coverage   81.26%   81.32%   +0.05%     
==========================================
  Files          10       10              
  Lines        1281     1285       +4     
  Branches      192      192              
==========================================
+ Hits         1041     1045       +4     
  Misses        178      178              
  Partials       62       62              

Files Changed	Coverage Δ
src/snowflake/sqlalchemy/__init__.py	83.33% <ø> (ø)
src/snowflake/sqlalchemy/snowdialect.py	77.87% <ø> (ø)
src/snowflake/sqlalchemy/base.py	91.57% <100.00%> (+0.06%)	⬆️
src/snowflake/sqlalchemy/custom_types.py	92.42% <100.00%> (+0.23%)	⬆️

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[sfc-gh-mkeller]

Please fix tests before merging!

🚢 🚢