Add JsonB Operators to Agtype

[JoshInnis]

Add JsonB Operators from Postgres to Agtype and allow in the Cypher command.

Initial Discussion https://github.com/apache/age/discussions/199

Postgres JsonB Operator Documentation: https://www.postgresql.org/docs/11/functions-json.html

[JoshInnis]

Add JsonB Operators from Postgres to Agtype and the Cypher Grammar

[JoshInnis]

Status: Formatting Issues, to be rebased for both Postgres 11 and 12 versions.

[jrgemignani]

@MuhammadTahaNaveed @Zainab-Saad Please close this issue when completed. Also, good job on the work that you have put into in this patch!