PHPLIB-1798 Extract MQL definition into a submodule for builder generator

[GromNaN]

Note

This PR stay in draft while we work on the instable mongodb/mql-specifications project.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.94%. Comparing base (233f7c7) to head (fbaf545).
⚠️ Report is 3 commits behind head on v2.x.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##               v2.x    #1851      +/-   ##
============================================
+ Coverage     87.91%   87.94%   +0.02%     
- Complexity     3208     3216       +8     
============================================
  Files           428      428              
  Lines          6390     6410      +20     
============================================
+ Hits           5618     5637      +19     
- Misses          772      773       +1     

Flag	Coverage Δ
6.0-replica_set	86.73% <ø> (+0.02%)	⬆️
6.0-server	82.63% <ø> (-0.14%)	⬇️
6.0-sharded_cluster	86.52% <ø> (+0.02%)	⬆️
8.0-replica_set	87.80% <ø> (+0.02%)	⬆️
8.0-server	83.40% <ø> (-0.14%)	⬇️
8.0-sharded_cluster	87.62% <ø> (+0.02%)	⬆️

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