Improve SQLAlchemy FloatVector type implementation

[amotl]

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Improved type support for FloatVector.

[codecov]

Codecov Report

Attention: 57 lines in your changes are missing coverage. Please review.

Comparison is base (14cf7c2) 85.00% compared to head (5c30efc) 83.38%.
Report is 1 commits behind head on main.

❗ Current head 5c30efc differs from pull request most recent head 4b0d9e6. Consider uploading reports for the commit 4b0d9e6 to get more accurate results

Files	Patch %	Lines
target_cratedb/sqlalchemy/vector.py	48.00%	26 Missing ⚠️
target_cratedb/tests/test_standard_target.py	84.34%	18 Missing ⚠️
target_cratedb/connector.py	77.77%	8 Missing ⚠️
target_cratedb/sinks.py	92.98%	4 Missing ⚠️
target_cratedb/sqlalchemy/patch.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   85.00%   83.38%   -1.62%     
==========================================
  Files           7        7              
  Lines         680      710      +30     
==========================================
+ Hits          578      592      +14     
- Misses        102      118      +16     

Flag	Coverage Δ
main	83.38% <79.49%> (-1.62%)	⬇️

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