feat: fallback file ext map

[hougesen]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 86.79245% with 28 lines in your changes missing coverage. Please review.

Project coverage is 69.99%. Comparing base (3c3508a) to head (3140f42).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
mdsf/src/formatters/erlfmt.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/ktfmt.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/ocamlformat.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/ocp_indent.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/scalafmt.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/stylish_haskell.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/swift_format.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/swiftformat.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/veryl.rs	0.00%	2 Missing ⚠️
mdsf/src/formatters/zprint.rs	0.00%	2 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #467      +/-   ##
==========================================
+ Coverage   69.34%   69.99%   +0.65%     
==========================================
  Files         229      230       +1     
  Lines        9177     9183       +6     
==========================================
+ Hits         6364     6428      +64     
+ Misses       2813     2755      -58     

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