Added option to gracefully shut down CAPIO server with SIGUSR1

[marcoSanti]

This pull request introduces a new mechanism to gracefully shut down the capio_server component. To use this feature, send the SIGUSR1 signal to the CAPIO server component instead of the usual SIGTERM. The capio_server instance will then:

• Reject all new handshake requests, forcing the workflow step that has sent it to terminate
• Empty the request queues so that all non blocking requests can be processed
  And finally terminate the execution.

Other changes carried out includes:

• moved from exit(EXIT_FAILURE) to using native c++ exceptions.
• Fixed compilation warnings
• Removed useless compilation targets

[codecov]

Codecov Report

❌ Patch coverage is 48.91304% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.69%. Comparing base (a7f0bd2) to head (59a33bd).
⚠️ Report is 1 commits behind head on capio-v2.

Files with missing lines	Patch %	Lines
src/posix/utils/filesystem.hpp	42.30%	6 Missing and 9 partials ⚠️
...c/server/client-manager/request_handler_engine.hpp	35.29%	8 Missing and 3 partials ⚠️
src/server/utils/signals.hpp	55.55%	8 Missing ⚠️
src/posix/handlers/copy_file_range.hpp	0.00%	2 Missing and 1 partial ⚠️
src/posix/handlers/posix_readdir.hpp	50.00%	2 Missing and 1 partial ⚠️
src/server/file-manager/file_manager_impl.hpp	0.00%	0 Missing and 3 partials ⚠️
src/server/capio-cl-engine/json_parser.hpp	0.00%	2 Missing ⚠️
src/common/capio/semaphore.hpp	0.00%	0 Missing and 1 partial ⚠️
src/server/client-manager/client_manager.hpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           capio-v2     #157      +/-   ##
============================================
- Coverage     44.83%   44.69%   -0.14%     
============================================
  Files            79       79              
  Lines          4403     4423      +20     
  Branches       2616     2630      +14     
============================================
+ Hits           1974     1977       +3     
- Misses         1195     1210      +15     
- Partials       1234     1236       +2     

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