hashfile: drop default dos2unix behavior

[pmrowla]

• old dos2unix detected text heuristics behavior is now only done explicitly when hash name is md5-dos2unix
• the default md5 hash is now real MD5, with no dos2unix text handling
• removes automatic text detection (hash_file(text=...)) API
  • removes --text and --binary options from CLI hashing utility

[codecov-commenter]

Codecov Report

Patch coverage: 70.68% and project coverage change: +0.01 🎉

Comparison is base (5377d63) 61.10% compared to head (8df182e) 61.12%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #362      +/-   ##
==========================================
+ Coverage   61.10%   61.12%   +0.01%     
==========================================
  Files          54       54              
  Lines        3664     3694      +30     
  Branches      653      659       +6     
==========================================
+ Hits         2239     2258      +19     
- Misses       1294     1303       +9     
- Partials      131      133       +2     

Impacted Files	Coverage Δ
src/dvc_data/hashfile/build.py	17.32% <0.00%> (ø)
src/dvc_data/index/save.py	76.47% <0.00%> (ø)
src/dvc_data/hashfile/state.py	32.55% <20.00%> (-1.33%)	⬇️
src/dvc_data/cli.py	31.65% <50.00%> (ø)
src/dvc_data/hashfile/tree.py	55.12% <63.63%> (+0.01%)	⬆️
src/dvc_data/hashfile/hash.py	78.18% <95.83%> (+2.42%)	⬆️
tests/hashfile/test_hash.py	100.00% <100.00%> (ø)
tests/hashfile/test_hash_stream.py	100.00% <100.00%> (ø)
tests/hashfile/test_tree.py	100.00% <100.00%> (ø)

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