PlSqlLexer.g4 supporting SQLPlus commands as parser Rules

[chandra-kambham]

Currently, the SQL Plus commands (prompt, spool, etc) are written using Lexer Rules such that any line starts with PROMPT till EOL it matches to a Lexer token, but if some other DDL/DML using PROMPT as an identifier the parsing of those sql fails. for ex:

create table test(
PROMPT varchar2(111),
SPOOL  varchar2(111) 
);

Is there any way we can change these to parser rules instead of lexer rules to avoid the above use-case?