Swap 3206 - Added custom jwt token creation

[nitrosx]

Description

This PR adds a new endpoint under users to create a custom jwt for the user specified.

Motivation

Ingestion in most facilities is done by automated processes. It is hard to guarantee success of ingestion when we rely on username and password to generate a time-limited token. With this PR, admin users can create jwt token with no expiration that can be used in this kind of use case.

Changes:

• userController: added /jwt endpoint to create jwt token for user with id with custom expiration date that can be used only by admin users
• userService: added functionality to create a custom jwt
• casl: added UserCreateJwt action and permission to create jwt token

Tests included/Docs Updated?

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)
• Docs updated?
• New packages used/requires npm install?
• Toggle added for new features?