feat(mongodb): accept string arguments in Int32/NumberInt helpers (#64)

Int32("123") and NumberInt("456") are valid in mongosh but the grammar
only accepted NUMBER tokens. Align with Long/NumberLong which already
supports both forms.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: h3n4l

mongodb/MongoShellParser.g4

@@ -819,9 +819,9 @@ longHelper
     : (LONG | NUMBER_LONG) LPAREN (NUMBER | stringLiteral) RPAREN
     ;
 
-// Int32(n), NumberInt(n)
+// Int32(n), Int32("n"), NumberInt(n), NumberInt("n")
 int32Helper
-    : (INT32 | NUMBER_INT) LPAREN NUMBER RPAREN
+    : (INT32 | NUMBER_INT) LPAREN (NUMBER | stringLiteral) RPAREN
     ;
 
 // Double(n)