Privatize CapioFile public class attributes

[marcoSanti]

This commit further refactors methods in the CapioFile class to better reflect the logic that they implement. It also moves public CapioFile attributes to private scope, exposing getter and setters for such attributes.

[codecov]

Codecov Report

❌ Patch coverage is 42.72727% with 63 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.50%. Comparing base (54108b4) to head (e87e8f8).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
capio/server/include/storage/capio_file.hpp	52.72%	13 Missing and 13 partials ⚠️
capio/server/include/remote/handlers/read.hpp	0.00%	1 Missing and 7 partials ⚠️
capio/server/include/handlers/read.hpp	12.50%	2 Missing and 5 partials ⚠️
capio/server/include/handlers/getdents.hpp	0.00%	1 Missing and 3 partials ⚠️
capio/server/include/handlers/stat.hpp	20.00%	0 Missing and 4 partials ⚠️
capio/server/include/remote/handlers/stat.hpp	0.00%	1 Missing and 2 partials ⚠️
capio/server/include/handlers/close.hpp	0.00%	0 Missing and 2 partials ⚠️
capio/server/include/handlers/write.hpp	50.00%	0 Missing and 2 partials ⚠️
capio/server/src/storage_manager.cpp	80.00%	0 Missing and 2 partials ⚠️
capio/tests/unit/server/src/storage_manager.cpp	0.00%	0 Missing and 2 partials ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   62.49%   62.50%   +0.01%     
==========================================
  Files          76       76              
  Lines        3317     3334      +17     
  Branches     2046     2059      +13     
==========================================
+ Hits         2073     2084      +11     
+ Misses        954      435     -519     
- Partials      290      815     +525     

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[GlassOfWhiskey]

LGTM