Query with SAFE_CAST couldn't be parsed #853

Describe the bug
A query with SAFE_CAST function used in it could not be parsed.

To Reproduce
Steps to reproduce the behavior:

1. Example query (reference

   SELECT SAFE_CAST("apple" AS INT64) AS not_a_number;

2. Parsing using JSqlParser

       try {
           Statement safeCastSt =
                   CCJSqlParserUtil.parse("SELECT SAFE_CAST(\"apple\" AS INT64) AS not_a_number");
       } catch (JSQLParserException e) {
           e.printStackTrace();
       }

3. Exception thrown

net.sf.jsqlparser.JSQLParserException
	at net.sf.jsqlparser.parser.CCJSqlParserUtil.parse(CCJSqlParserUtil.java:51)
    ...
    <snipped>
    ...
Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "(" "("
    at line 1, column 17.

Was expecting one of:

    "&"
    ","
    "::"
    ";"
    "<<"
    ">>"
    "ACTION"
    ...

Expected behavior
The query would parse successfully.

System

• Java Version: 11.0.3
• JSqlParser version: 3.0