Adopt immutable Collection DSL from Data

[alganet]

Replace chaining, __get, ArrayAccess, and proxy methods with constructor composition via with/filter/required params. Remove Filtered support, simplify persist and query building.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.06%. Comparing base (ef89a8a) to head (795c0d4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Mapper.php	90.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #115      +/-   ##
============================================
- Coverage     99.55%   99.06%   -0.49%     
+ Complexity      176      170       -6     
============================================
  Files             3        3              
  Lines           448      429      -19     
============================================
- Hits            446      425      -21     
- Misses            2        4       +2     

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