Chore: Clean up and refactor SQLAlchemy polyfills

[amotl]

... to cratedb_toolkit.util.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.04%. Comparing base (19c5cff) to head (a9192f7).

❗ There is a different number of reports uploaded between BASE (19c5cff) and HEAD (a9192f7). Click for more details.

HEAD has 14 uploads less than BASE

Flag	BASE (19c5cff)	HEAD (a9192f7)
influxdb	4	0
mongodb	10	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
- Coverage   82.01%   72.04%   -9.97%     
==========================================
  Files          81       79       -2     
  Lines        3247     3209      -38     
==========================================
- Hits         2663     2312     -351     
- Misses        584      897     +313     

Flag	Coverage Δ
influxdb	?
main	59.98% <50.00%> (-0.47%)	⬇️
mongodb	?
pymongo	42.34% <100.00%> (+0.21%)	⬆️

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