fix(plsql): add missing tokens to regular_id rule (#48)

Add new tokens from the grammar sync to the regular_id rule so they
can be used as identifiers:
- ITEMS, BYTES, LINES, RECORDS, FIELD, MASK, NEWLINE_
- CHARSETFORM, CHARSETID, DURATION, ENABLED, MAXLEN
- ERROR_CODE, ERROR_INDEX
- EXTEND, NOEXTEND, NOSCALE, NOSHARD, SHARD, POLYMORPHIC

These tokens were added to the lexer in the grammar sync but were
not added to regular_id, causing them to be treated as reserved
keywords that cannot be used as identifiers.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: vsai12

plsql/PlSqlParser.g4

@@ -7512,6 +7512,26 @@ regular_id
     | REGULAR_ID
     | ABSENT
     | A_LETTER
+    | BYTES
+    | CHARSETFORM
+    | CHARSETID
+    | DURATION
+    | ENABLED
+    | ERROR_CODE
+    | ERROR_INDEX
+    | EXTEND
+    | FIELD
+    | ITEMS
+    | LINES
+    | MASK
+    | MAXLEN
+    | NEWLINE_
+    | NOEXTEND
+    | NOSCALE
+    | NOSHARD
+    | POLYMORPHIC
+    | RECORDS
+    | SHARD
     | AGENT
     | AGGREGATE
     | ANALYZE