remove hashfile

[efiop]

hashfile for now mostly belongs in dvc-data.

[codecov-commenter]

Codecov Report

Merging #60 (8de6ac2) into main (98849ea) will decrease coverage by 3.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   48.81%   45.34%   -3.48%     
==========================================
  Files          49       34      -15     
  Lines        2583     2007     -576     
  Branches      311      238      -73     
==========================================
- Hits         1261      910     -351     
+ Misses       1298     1078     -220     
+ Partials       24       19       -5     

Impacted Files	Coverage Δ
tests/conftest.py	38.02% <0.00%> (-52.12%)	⬇️
src/dvc_objects/fs/implementations/local.py	54.03% <0.00%> (-3.23%)	⬇️
src/dvc_objects/fs/system.py	80.88% <0.00%> (-2.95%)	⬇️
src/dvc_objects/fs/base.py	44.98% <0.00%> (-1.86%)	⬇️

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