Add support for bigint to cast function

For reference,
https://dev.mysql.com/doc/refman/5.6/en/cast-functions.html
https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html
https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html
https://www.postgresql.org/docs/12/sql-expressions.html#SQL-SYNTAX-TYPE-CASTS
https://www.postgresql.org/docs/9.1/datatype-numeric.html