Request to Add bigint as a keyword for plsql for formatting it to uppercase

[sanjeet-jain]

Describe the bug
Request to Add bigint as a keyword for plsql

To Reproduce
Steps to reproduce the behavior:

1. create any plsql file and use bigint in lowercase, when formatted with the following settings it still doesnt become uppercase

"sqltools.format": {

"language": "pl/sql",

"reservedWordCase": "upper"

},

Expected behavior
bigint is a valid keyword in plsql and should be formatted to uppercase with the settings above

[sanjeet-jain]

there might be more keyword references in https://www.postgresql.org/docs/current/sql-keywords-appendix.html which arent covered in the repo or extension and should be there :)