Merged PR 1615832: Support for pushdown of in to PFE indexes

### Does this PR have any customer impact?

### Type (Feature, Refactoring, Bugfix, DevOps, Testing, Perf, etc)

### Does it involve schema level changes? (Table, Column, Index, UDF, etc level changes)

### Are you introducing any new config? If yes, do you have tests with and without them being set?

### ChangeLog (Refer [Template](../oss/CHANGELOG.md))

### Description

Support for pushdown of  to PFE indexes

----
#### AI description  (iteration 1)
#### PR Classification
New feature

#### PR Summary
This pull request adds support for pushdown operations to PFE indexes, enhancing query performance and index utilization.
- Added new functions in `sql/udfs/index_mgmt/bson_indexbounds_functions--0.102-0.sql` for BSON index bounds operations.
- Introduced new operators in `sql/operators/bson_btree_pfe_operators--0.102-0.sql` for BSON and BSON query comparisons.
- Updated `src/query/query_operator.c` to handle new index bounds operators and expressions.
- Added new type definitions in `sql/types/bsonindexbounds--0.102-0.sql` for BSON index bounds.
- Modified `src/metadata/metadata_cache.c` to include OIDs and functions for BSON index bounds types and operators.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: visridha

CHANGELOG.md

@@ -7,20 +7,14 @@
 * Support current_op command *[Feature]* (#59)
 * Support for list_databases command *[Feature]* (#45)
 * Disable analyze statistics for unique index uuid columns which improves resource usage *[Perf]*
-* Support collation with $expr *[Feature]*
-* Support collation with aggregation $project *[Feature]*
-* Support collation with `$cmp`, `$eq`, `$ne`, `$lt`, `$lte`, `$gt`, `$gte` comparison operators *[Feature]*
-* Support collation with `$in` array operator *[Feature]*
+* Support collation with `$expr`, `$in`, `$cmp`, `$eq`, `$ne`, `$lt`, `$lte`, `$gt`, `$gte` comparison operators (Opt-in) *[Feature]*
+* Support collation in `find`, aggregation `$project`, `$redact`, `$set`, `$addFields`, `$replaceRoot` stages (Opt-in) *[Feature]*
+* Support collation with `$setEquals`, `$setUnion`, `$setIntersection`, `$setDifference`, `$setIsSubet` in the aggregation pipeline (Opt-in) *[Feature]*
 * Support unique index truncation by default with new operator class *[Feature]*
-* Support collation in aggregation `$redact` stage *[Feature]*
-* Support collation in aggregation `find` *[Feature]*
-* Support collation in aggregation `$set` stage *[Feature]*
-* Support collation in aggregation `$addFields` stage *[Feature]*
-* Support collation with `$setEquals`, `$setUnion`, `$setIntersection`, `$setDifference`, `$setIsSubet` in the aggregation pipeline *[Feature]*
-* Support collation in aggregation `$replaceRoot` stage *[Feature]*
 * Top level aggregate command `let` variables support for `$geoNear` stage *[Feature]*
 * Enable Backend Command support for Statement Timeout *[Feature]*
 * Support type aggregation operator `$toUUID`. *[Feature]* 
+* Support Partial filter pushdown for `$in` predicates *[Perf]*
 * Support the $dateFromString operator with full functionality *[Feature]*
 * Support extended syntax for `$getField` aggregation operator. Now the value of 'field' could be an expression that resolves to a string. *[Feature]*
 

internal/pg_documentdb_distributed/src/test/regress/expected/bson_aggregation_pipeline_tests_vector_hnsw.out

@@ -553,7 +553,7 @@ END;
 BEGIN;
 SET LOCAL documentdb_core.enablecollation TO on;
 EXPLAIN(VERBOSE ON, COSTS OFF)SELECT document FROM bson_aggregation_find('db', '{ "find": "ci_search", "filter": { "a" : {"$in" : [[{ "b" : "caT"}], [{ "c" : "caT"}]] }}, "sort": { "_id": 1 }, "skip": 0, "limit": 100, "collation": { "locale": "en", "strength" : 1} }');
-                                                                                                                                                                                                                                                                     QUERY PLAN                                                                                                                                                                                                                                                                      
+                                                                                                                                                                                                                                                                                                                                                                                                     QUERY PLAN                                                                                                                                                                                                                                                                                                                                                                                                      
 ---------------------------------------------------------------------
  Limit
    Output: remote_scan.document, remote_scan."?sort?"
@@ -565,7 +565,7 @@ EXPLAIN(VERBOSE ON, COSTS OFF)SELECT document FROM bson_aggregation_find('db', '
                Task Count: 8
                Tasks Shown: One of 8
                ->  Task
-                     Query: SELECT document, documentdb_api_catalog.bson_orderby(document, '{ "_id" : { "$numberInt" : "1" } }'::documentdb_core.bson) AS "?sort?" FROM documentdb_data.documents_7990_7990016 collection WHERE documentdb_api_catalog.bson_dollar_in(document, '{ "a" : [ [ { "b" : "caT" } ], [ { "c" : "caT" } ] ], "collation" : "en-u-ks-level1" }'::documentdb_core.bson) ORDER BY (documentdb_api_catalog.bson_orderby(document, '{ "_id" : { "$numberInt" : "1" } }'::documentdb_core.bson)) NULLS FIRST LIMIT '100'::bigint
+                     Query: SELECT document, documentdb_api_catalog.bson_orderby(document, '{ "_id" : { "$numberInt" : "1" } }'::documentdb_core.bson) AS "?sort?" FROM documentdb_data.documents_7990_7990016 collection WHERE (documentdb_api_catalog.bson_dollar_in(document, '{ "a" : [ [ { "b" : "caT" } ], [ { "c" : "caT" } ] ], "collation" : "en-u-ks-level1" }'::documentdb_core.bson) AND (document OPERATOR(documentdb_api_internal.##=) ANY ('{"{ \"a\" : [ { \"b\" : \"caT\" } ], \"collation\" : \"en-u-ks-level1\" }","{ \"a\" : [ { \"c\" : \"caT\" } ], \"collation\" : \"en-u-ks-level1\" }"}'::documentdb_api_internal.bsonindexbounds[]))) ORDER BY (documentdb_api_catalog.bson_orderby(document, '{ "_id" : { "$numberInt" : "1" } }'::documentdb_core.bson)) NULLS FIRST LIMIT '100'::bigint
                      Node: host=localhost port=58070 dbname=regression
                      ->  Limit
                            Output: document, (documentdb_api_catalog.bson_orderby(document, '{ "_id" : { "$numberInt" : "1" } }'::documentdb_core.bson))