Feature: JDBC driver for postgresql

[jack1902]

When using AWS, it is possible to use the AWS JDBC Driver for PostgreSQL which significantly simplifies connecting to a database from an application using IAM authentication.

It would be amazing to have something similar within azure, such that I can specify the driver and any parameters within the JDBC connection string to empower database access.

Generally, I connect as the admin within migration scripts to configure additional roles and permissions within the database. Connecting as the additional roles which map to workload-indentities within AKS is slightly painful currently as the application needs to be aware of the PostgreSQL endpoint of Azure such that it can:

• create an access token from the given identity-token
• refresh the token before it expires (ensures any new connections being opened within the long-running app work)

Having the ability to abstract this logic into a driver feels right, as the application is unaware of the implementation details around authentication to PostgreSQL besides a driver.