Add path-scoped JSON collection strategies

Introduce an opt-in DeepJSONDiff facade with path-scoped collection strategies for semantic identity matching, filtering, sorting, normalization, missing and duplicate identity policies, diagnostics, tests, and documentation while preserving existing DeepDiff behavior.

Author: akshat62

deepdiff/__init__.py

@@ -12,3 +12,12 @@
 from .deephash import DeepHash as DeepHash
 from .delta import Delta as Delta
 from .path import extract as extract, parse_path as parse_path
+from .json_diff import (
+    CollectionStrategy as CollectionStrategy,
+    CollectionStrategyError as CollectionStrategyError,
+    DeepJSONDiff as DeepJSONDiff,
+    DuplicateIdentityError as DuplicateIdentityError,
+    DuplicateIdentityPolicy as DuplicateIdentityPolicy,
+    IdentityExtractionError as IdentityExtractionError,
+    MissingIdentityPolicy as MissingIdentityPolicy,
+)