ENH: add file validation hook

[neutrinoceros]

fix #39

[codecov]

Codecov Report

Merging #74 (923da59) into main (b7a2049) will decrease coverage by 0.12%.
The diff coverage is 98.63%.

❗ Current head 923da59 differs from pull request most recent head bd4598d. Consider uploading reports for the commit bd4598d to get more accurate results

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
- Coverage   99.58%   99.45%   -0.13%     
==========================================
  Files          17       19       +2     
  Lines         480      552      +72     
==========================================
+ Hits          478      549      +71     
- Misses          2        3       +1     

Flag	Coverage Δ
unittests	99.45% <98.63%> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
tests/test_schema_validation.py	100.00% <ø> (ø)
inifix/validation.py	96.77% <90.90%> (-3.23%)	⬇️
inifix/__init__.py	100.00% <100.00%> (ø)
inifix/iniconf.py	100.00% <100.00%> (ø)
inifix/validate.py	100.00% <100.00%> (ø)
tests/test_file_validation.py	100.00% <100.00%> (ø)

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