Implement endpoints needed for Permissions revamp

[pavish]

Items below are arranged in order of implementation. This order might change during the course of implementation.

Home page

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1. database_setup.connect_existing #3654
   +0
   
2. database_setup.create_new #3655
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3. databases.list #3656
   +0
   

Databases page

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1. databases.get
2. roles.list: (database_id) => RoleInfo[] #3659
   +0
   
3. roles.store_in_mathesar: (database_id, role_oid, password) => void #3660
   +0
4. roles.remove_stored_role_configuration: (database_id, role_oid) => void #3661
   +0
5. collaborators.list #3657
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6. collaborators.add #3658
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7. collaborators.delete
8. collaborators.modify_role_for_user
9. databases.privileges.list (if possible combine with databases.list) #3662
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10. databases.privileges.grant
11. databases.privileges.revoke
12. databases.privileges.transfer_ownership
13. roles.add: (database_id, role_name, password) => RoleInfo
14. roles.delete: (database_id, role_oid) => void
15. roles.add_members: (database_id, role_oid, members: role_oids[]) => RoleInfo
16. roles.remove_members: (database_id, role_oid, members: role_oids[]) => RoleInfo
17. schemas.list: should include privilege information for all roles
18. schemas.add: should require owning role
19. roles.grant_admin_option_to_member: (database_id, role_oid, member_role_oid) => RoleInfo
20. roles.revoke_admin_option_to_member: (database_id, role_oid, member_role_oid) => RoleInfo
21. databases.disconnect
22. databases.list_databases_in_server
23. databases.drop
24. databases.privileges.list_owned_objects_recursively
25. databases.privileges.transfer_ownership_recursively

Schemas page

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1. schemas.get: should include privilege information for all roles
2. schemas.privileges.grant
3. schemas.privileges.revoke
4. schemas.privileges.transfer_ownership
5. tables.list: should include privilege information for all roles
6. tables.add: should require owning role
7. schemas.privileges.list_owned_objects_recursively
8. schemas.privileges.transfer_ownership_recursively

Tables page

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1. tables.get: should include privilege information for all roles
2. tables.privileges.grant
3. tables.privileges.revoke
4. tables.privileges.transfer_ownership

Users

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1. Add accent colors and avatar initials to users

[pavish]

Related document: https://hackmd.io/@mathesar/rkjSF5IUC