feat: refactor user storage, change picture to bytes type

[JurgenR]

Closes #103
Closes #82
Adds upload_permissions to user info reply ( for #79 )

[github-actions]

Test Results

       8 files  ±  0         8 suites  ±0   40s ⏱️ -1s
   594 tests  -   7     594 ✔️  -   7  0 💤 ±0  0 ❌ ±0 
4 752 runs   - 56  4 752 ✔️  - 56  0 💤 ±0  0 ❌ ±0 

Results for commit 5a93de4. ± Comparison against base commit d88f1cd.

This pull request removes 13 and adds 6 tests. Note that renamed tests count towards both.

tests.unit.room.test_room_model.TestModelRoom ‑ test_addMember_memberDoesNotExist_shouldAdd
tests.unit.room.test_room_model.TestModelRoom ‑ test_addMember_memberExists_shouldNotAdd
tests.unit.room.test_room_model.TestModelRoom ‑ test_addOperator_operatorDoesNotExist_shouldAdd
tests.unit.room.test_room_model.TestModelRoom ‑ test_addOperator_operatorExists_shouldNotAdd
tests.unit.room.test_room_model.TestModelRoom ‑ test_removeMember_memberDoesNotExist_shouldDoNothing
tests.unit.room.test_room_model.TestModelRoom ‑ test_removeMember_memberExists_shouldRemove
tests.unit.room.test_room_model.TestModelRoom ‑ test_removeOperator_operatorDoesNotExist_shouldDoNothing
tests.unit.room.test_room_model.TestModelRoom ‑ test_removeOperator_operatorExists_shouldRemove
tests.unit.user.test_user_manager.TestUserManager ‑ test_getOrCreateUser_existingUserByName_shouldReturnUser
tests.unit.user.test_user_manager.TestUserManager ‑ test_getOrCreateUser_existingUserByObject_shouldReturnUser
…

tests.unit.protocol.test_messages.TestPeerUserInfoReply ‑ test_PeerUserInfoReply_Request_deserialize_withPictureWithPermissions
tests.unit.protocol.test_messages.TestPeerUserInfoReply ‑ test_PeerUserInfoReply_Request_deserialize_withoutPictureWithPermissions
tests.unit.protocol.test_messages.TestPeerUserInfoReply ‑ test_PeerUserInfoReply_Request_serialize_withPictureWithPermissions
tests.unit.protocol.test_messages.TestPeerUserInfoReply ‑ test_PeerUserInfoReply_Request_serialize_withoutPictureWithPermissions
tests.unit.user.test_user_manager.TestUserManager ‑ test_getUserObject_existingUserByName_shouldReturnUser
tests.unit.user.test_user_manager.TestUserManager ‑ test_getUserObject_missingUserByName_shouldCreateAndReturnUser

♻️ This comment has been updated with latest results.