[ADD] Add absence concept in attendance server

[reichie020212]

Why is this change needed?

To add absence concept in the attendance module

How was the change implemented?

Added new field named attendance_category in the attendance.list then added this new field in UI and APIs.

New unit tests

None

Unit tests executed by the author

None

Related links

https://github.com/OpenSPP/openspp-ph-dswd-4p-modules/issues/2

[codecov]

Codecov Report

Attention: Patch coverage is 12.24490% with 43 lines in your changes missing coverage. Please review.

Project coverage is 72.66%. Comparing base (ca5926e) to head (5371960).

Files with missing lines	Patch %	Lines
spp_attendance/controllers/controllers.py	2.32%	42 Missing ⚠️
spp_attendance/models/attendance_subscriber.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             17.0     #671      +/-   ##
==========================================
- Coverage   72.73%   72.66%   -0.07%     
==========================================
  Files         667      667              
  Lines       17259    17281      +22     
  Branches     2195     2199       +4     
==========================================
+ Hits        12553    12558       +5     
- Misses       4305     4322      +17     
  Partials      401      401              

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[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[kneckinator]

There is also the branch spp_attendance_test_branch. Does this extend this branch and if so, should a PR to merge spp_attendance_test_branch into spp_attendance be created and applied first?