Implement Custom MongoDB Roles

[mgmonteleone]

• [ ] Get all custom MongoDB roles in the project.
• [ ] Get the custom MongoDB role named {ROLE-NAME}
• [ ] Create a new custom MongoDB role in the project.
• [ ] Update a custom MongoDB role in the project.
• [ ] Delete a custom MongoDB role from the project.

Method	Endpoint	Description
GET	/groups/{GROUP-ID}/customDBRoles/roles	Get all custom MongoDB roles in the project.
GET	/groups/{GROUP-ID}/customDBRoles/roles/{ROLE-NAME}	Get the custom MongoDB role named {ROLE-NAME}
POST	/groups/{GROUP-ID}/customDBRoles/roles	Create a new custom MongoDB role in the project.
PATCH	/groups/{GROUP-ID}/customDBRoles/roles/{ROLE-NAME}	Update a custom MongoDB role in the project.
DELETE	/groups/{GROUP-ID}/customDBRoles/{ROLE-NAME}	Delete a custom MongoDB role from the project.