Correctly buffer input/output streams for files

[ascopes]

This will provide a slight performance improvement on very large input/output files that are being analysed by the build process.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.91%. Comparing base (03489a5) to head (068ea16).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #691      +/-   ##
==========================================
- Coverage   91.95%   91.91%   -0.03%     
==========================================
  Files          56       56              
  Lines        1675     1667       -8     
  Branches      104      105       +1     
==========================================
- Hits         1540     1532       -8     
  Misses         99       99              
  Partials       36       36              

Files with missing lines	Coverage Δ
...thub/ascopes/protobufmavenplugin/fs/FileUtils.java	100.00% <100.00%> (ø)
...pes/protobufmavenplugin/fs/UriResourceFetcher.java	100.00% <100.00%> (ø)
...protobufmavenplugin/plugins/JvmPluginResolver.java	83.34% <100.00%> (+0.11%)	⬆️
...otobufmavenplugin/sources/ProtoSourceResolver.java	81.18% <100.00%> (ø)
...n/sources/incremental/IncrementalCacheManager.java	91.14% <100.00%> (ø)

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