v5.x - Remove more dependence on Facebook Folly.

[szmyd]

Remove usage of folly::Expected and folly::Unit in the API. folly::Future remains.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 34.54545% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.23%. Comparing base (0b40663) to head (c4ceff0).
⚠️ Report is 52 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/volume_mgr.cpp	24.00%	18 Missing and 1 partial ⚠️
src/lib/volume/volume.cpp	47.82%	8 Missing and 4 partials ⚠️
src/lib/volume/tests/test_volume_io.cpp	0.00%	3 Missing ⚠️
src/lib/volume/index_fixed_table.hpp	50.00%	2 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #147       +/-   ##
===========================================
+ Coverage   61.68%   72.23%   +10.54%     
===========================================
  Files          15       21        +6     
  Lines         462     1963     +1501     
  Branches       35      243      +208     
===========================================
+ Hits          285     1418     +1133     
- Misses        158      439      +281     
- Partials       19      106       +87     

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[raakella1]

LG!