feat(plsql): integrate upstream rules into grammar entry points

Integrates the upstream rules into the main grammar so they are actually
usable:

- Add create_schema to unit_statement
- Add drop_materialized_view_log to unit_statement
- Add accessible_by_clause to create_package, create_function_body,
  create_procedure_body
- Add annotations_clause to create_package, create_function_body,
  create_procedure_body
- Add default_collation_clause to create_package, create_function_body,
  create_procedure_body
- Add compound_trigger_block to trigger_body
- Integrate pipelined_using_clause into create_function_body for
  polymorphic table functions (ROW/TABLE POLYMORPHIC)

Test files added from upstream:
- examples/create_function03.sql (polymorphic pipelined function)
- examples/drop_materialized_view_log.sql

All 373 tests pass.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vsai12

plsql/PlSqlParser.g4

@@ -108,6 +108,7 @@ unit_statement
     | create_restore_point
     | create_role
     | create_rollback_segment
+    | create_schema
     | create_sequence
     | create_spfile
     | create_synonym
@@ -139,6 +140,7 @@ unit_statement
     | drop_library
     | drop_lockdown_profile
     | drop_materialized_view
+    | drop_materialized_view_log
     | drop_materialized_zonemap
     | drop_operator
     | drop_outline
@@ -478,9 +480,10 @@ match_string
 
 create_function_body
     : CREATE (OR REPLACE)? FUNCTION function_name (LEFT_PAREN parameter (COMMA parameter)* RIGHT_PAREN)?
-      RETURN type_spec (invoker_rights_clause | parallel_enable_clause | result_cache_clause | DETERMINISTIC)*
+      RETURN type_spec (invoker_rights_clause | accessible_by_clause | parallel_enable_clause | result_cache_clause | DETERMINISTIC | default_collation_clause | annotations_clause)*
       ((PIPELINED? (IS | AS) (DECLARE? seq_of_declare_specs? body | call_spec))
-        | (PIPELINED | AGGREGATE) USING implementation_type_name
+        | pipelined_using_clause
+        | AGGREGATE USING implementation_type_name
         | sql_macro_body
       ) SEMICOLON
     ;
@@ -594,7 +597,9 @@ alter_package
     ;
 
 create_package
-    : CREATE (OR REPLACE)? PACKAGE (schema_object_name PERIOD)? package_name invoker_rights_clause? (IS | AS) package_obj_spec* END package_name? SEMICOLON
+    : CREATE (OR REPLACE)? PACKAGE (schema_object_name PERIOD)? package_name
+      (invoker_rights_clause | accessible_by_clause | default_collation_clause | annotations_clause)*
+      (IS | AS) package_obj_spec* END package_name? SEMICOLON
     ;
 
 create_package_body
@@ -674,7 +679,7 @@ procedure_body
 
 create_procedure_body
     : CREATE (OR REPLACE)? PROCEDURE procedure_name (LEFT_PAREN parameter (COMMA parameter)* RIGHT_PAREN)?
-      invoker_rights_clause? (IS | AS)
+      (invoker_rights_clause | accessible_by_clause | default_collation_clause | annotations_clause)* (IS | AS)
       (DECLARE? seq_of_declare_specs? body | call_spec | EXTERNAL) SEMICOLON
     ;
 
@@ -773,7 +778,7 @@ non_dml_trigger
     ;
 
 trigger_body
-    : COMPOUND TRIGGER
+    : compound_trigger_block
     | CALL identifier
     | trigger_block
     ;

plsql/examples/create_function03.sql

@@ -0,0 +1,2 @@
+CREATE FUNCTION process_table(tab       TABLE)
+RETURN TABLE PIPELINED ROW POLYMORPHIC USING process_table_pkg;

plsql/examples/drop_materialized_view_log.sql

@@ -0,0 +1,3 @@
+DROP MATERIALIZED VIEW LOG ON MY_SCHEMA.MY_TABLE;
+
+DROP MATERIALIZED VIEW LOG IF EXISTS ON MY_SCHEMA.MY_TABLE;