feat: export type SyncFileSystem and type BaseFileSystem

[carlocorradini]

Fix #447

I also exported BaseFileSystem since it is widely used in the CachedInputFileSystem class.

[linux-foundation-easycla]

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• ✅ login: carlocorradini / name: Carlo Corradini (4918c5b)
• ✅ login: alexander-akait / name: Alexander Akait (3c9d4b6)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.41%. Comparing base (40a4050) to head (3c9d4b6).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #448   +/-   ##
=======================================
  Coverage   92.41%   92.41%           
=======================================
  Files          44       44           
  Lines        2149     2149           
  Branches      662      662           
=======================================
  Hits         1986     1986           
  Misses        132      132           
  Partials       31       31           

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[alexander-akait]

Thanks