Internally add flag for switching MatchSpec parser

[AntoinePrv]

Currently, a lot of MatchSpec (all from adding package dependencies) are parsed by libsolv, due to lack of maturity (and performance?) for our implementation. To use resolvo and to get more control over the implementation of the dependencies, we need to start using our own implementation more.

This PR should... change nothing, not even libmamba ABI. It introduces internal refactors required for having the option to change the parser (which will be in a follow-up PR).

[codecov]

Codecov Report

Attention: Patch coverage is 86.81818% with 29 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@939ed2f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
libmamba/src/solver/libsolv/helpers.cpp	78.26%	20 Missing ⚠️
libmamba/ext/solv-cpp/src/dependency.cpp	57.14%	6 Missing ⚠️
libmamba/src/solver/libsolv/unsolvable.cpp	86.66%	2 Missing ⚠️
libmamba/src/specs/match_spec.cpp	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3905   +/-   ##
=======================================
  Coverage        ?   62.91%           
=======================================
  Files           ?      300           
  Lines           ?    37124           
  Branches        ?     2780           
=======================================
  Hits            ?    23356           
  Misses          ?    13716           
  Partials        ?       52           

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