Do not use CTRL+C to close the app, only use quit/exit

[depink5]

This PR avoids using CTRL+C in fastddsspy to close the application.

Merge after:

• Add Arrow Up/Down feature to navigate Command History and Left/Right Arrow to edit command #136

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 62.17%. Comparing base (2f19b0c) to head (e1003b8).

Files with missing lines	Patch %	Lines
cpp_utils/src/cpp/event/StdinEventHandler.cpp	14.28%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
- Coverage   62.37%   62.17%   -0.21%     
==========================================
  Files          65       65              
  Lines        1858     1864       +6     
  Branches      534      535       +1     
==========================================
  Hits         1159     1159              
- Misses        379      384       +5     
- Partials      320      321       +1     

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[Carlosespicur]

LGTM. Waiting for CI.

Test with DDS Router and DDS Recorder tools first

[rsanchez15]

Update this section in docs

https://fast-dds-spy.readthedocs.io/en/latest/rst/user_manual/tool.html#close-application

[depink5]

Update this section in docs

https://fast-dds-spy.readthedocs.io/en/latest/rst/user_manual/tool.html#close-application

Done here:

• Update the documentation section corresponding to quitting the application. Fast-DDS-spy#120