test: add test for enum reflection

[Mause]

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[codecov]

Codecov Report

Merging #450 (7d2f082) into master (3e76ef6) will decrease coverage by 6.14%.
The diff coverage is 31.81%.

❗ Current head 7d2f082 differs from pull request most recent head 1cb1d6e. Consider uploading reports for the commit 1cb1d6e to get more accurate results

@@            Coverage Diff             @@
##           master     #450      +/-   ##
==========================================
- Coverage   94.63%   88.49%   -6.15%     
==========================================
  Files           9        9              
  Lines         541      539       -2     
==========================================
- Hits          512      477      -35     
- Misses         29       62      +33     

Impacted Files	Coverage Δ
duckdb_engine/tests/test_basic.py	92.38% <21.05%> (-7.12%)	⬇️
duckdb_engine/__init__.py	89.43% <100.00%> (+1.57%)	⬆️
duckdb_engine/tests/test_ibis.py	19.23% <0.00%> (-76.93%)	⬇️
duckdb_engine/tests/test_datatypes.py	100.00% <0.00%> (ø)
duckdb_engine/tests/test_integration.py	100.00% <0.00%> (ø)

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