Refactor of _location data structure

[marcoSanti]

This commit refactors the structure of the capiocl::Engine::_locations, by removing the entry tuple and replacing with a more understandable struct. It also updates the logic of the capiocl::Engine class to use the new format of the _location hashmap

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.41341% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.33%. Comparing base (c4cfb8e) to head (727258e).

Files with missing lines	Patch %	Lines
src/Engine.cpp	95.45%	0 Missing and 6 partials ⚠️
capiocl.hpp	66.66%	0 Missing and 3 partials ⚠️
src/Serializer.cpp	94.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   95.46%   95.33%   -0.13%     
==========================================
  Files           4        4              
  Lines         772      772              
  Branches      444      442       -2     
==========================================
- Hits          737      736       -1     
  Misses          2        2              
- Partials       33       34       +1     

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