Deprecate Library Roles and Permissions in edx-platform

[MaferMazu]

Description

Remove:

• API methods regarding authorization in https://github.com/openedx/edx-platform/tree/a0b4f8168659795a5c356e83b4dfed16fb4282ae/openedx/core/djangoapps/content_libraries/api
• The Rest API methods regarding authorization in https://github.com/openedx/edx-platform/tree/a0b4f8168659795a5c356e83b4dfed16fb4282ae/openedx/core/djangoapps/content_libraries/rest_api
• The library's permissions: https://github.com/openedx/edx-platform/blob/a0b4f8168659795a5c356e83b4dfed16fb4282ae/openedx/core/djangoapps/content_libraries/permissions.py
• ContentLibraryPermission model: https://github.com/openedx/edx-platform/blob/a0b4f8168659795a5c356e83b4dfed16fb4282ae/openedx/core/djangoapps/content_libraries/models.py#L186

Additional info

openedx/openedx-platform#37409

Related issue: #79

[MaferMazu]

We probably won't be able to fully remove permissions.py because we currently depend on bridgekeeper for some things.

Reference: https://github.com/openedx/openedx-platform/blob/release/verawood/openedx/core/djangoapps/content_libraries/api/libraries.py#L252