__repr__ method

[bigcat88]

• __repr__ method added for most objects(previously it was only present for FsNode).
• notifications.Notification class has been rewritten in the same format as all the others.

[codecov]

Codecov Report

Merging #147 (f50151a) into main (5750e9a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #147   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          34       34           
  Lines        3061     3091   +30     
=======================================
+ Hits         3054     3084   +30     
  Misses          7        7           

Files	Coverage Δ
nc_py_api/activity.py	100.00% <100.00%> (ø)
nc_py_api/apps.py	100.00% <100.00%> (ø)
nc_py_api/files/__init__.py	100.00% <100.00%> (ø)
nc_py_api/notes.py	98.90% <100.00%> (+0.02%)	⬆️
nc_py_api/notifications.py	100.00% <100.00%> (ø)
nc_py_api/talk.py	100.00% <100.00%> (ø)
nc_py_api/talk_bot.py	100.00% <100.00%> (ø)
nc_py_api/user_status.py	100.00% <100.00%> (ø)
nc_py_api/users.py	100.00% <100.00%> (ø)
nc_py_api/users_groups.py	100.00% <100.00%> (ø)