Generalize SetMatcher to support Document Model

[pl04351820]

For golden result [{"total_orders": {"int": 15}}] . Current Firestore runs returns following errors:

"unhashable type: 'dict'". 

• The PR adds Auto-detected based on nested structures and uses Counter/Multiset comparisons (respects duplicate counts).
• For Classic SQL: Keep it backward compatible (Set semantics, ignores column names).
• Tests: Added test cases in evalbench/test/set_matcher_test.py covering match cases.

[IsmailMehdi]

/gcbrun