Add parse cache

[micheleorselli]

wip:

• the current cache implementation does not consider in Runner::doRun we have $config->getClassSetRules() which can return multiple ClassSet objects, so either we create a separate cache per ClassSet of we fix the implementation to have one single cache
• the cache object relies on __destruct to save the cached result back, I'm not totally sure this is ok 🤔
• caching serialized objects opens to the problem of rehydrating an object with a different shape than the one cached. we should test this scenario
• how do we manage cache expiration? e.g we cache a file, then the file is deleted -> how do we purge it from the cache?
• maybe it is worth testing Symfony Cache component

[codecov]

Codecov Report

❌ Patch coverage is 98.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.29%. Comparing base (9498feb) to head (58a6dd2).

Files with missing lines	Patch %	Lines
src/CLI/Config.php	85.71%	1 Missing ⚠️
src/CLI/Runner.php	97.29%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #603      +/-   ##
============================================
- Coverage     98.31%   98.29%   -0.03%     
- Complexity      681      706      +25     
============================================
  Files            86       89       +3     
  Lines          1960     2047      +87     
============================================
+ Hits           1927     2012      +85     
- Misses           33       35       +2     

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