add layer apis

[danangmassandy]

This is for ConservationInternational/cplus-plugin#360.

• Provide an API to upload layers by a user.
• Provide an API to list existing uploaded layers.
• Provide an API to delete existing uploaded layer.
• Provide an API to fetch detail of single layer.

For other acceptance criteria in the ticket, I'll submit in new PR (might to create new tickets as well to track these items).

This is still work in progress with pending todos:

• Add api tests
• Add validations

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
1447	1343	93%	0%	🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: 650a0bb by action🐍

[codecov]

Codecov Report

Attention: Patch coverage is 99.04535% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 92.80%. Comparing base (5ec3782) to head (650a0bb).

Files	Patch %	Lines
django_project/cplus_api/tests/common.py	94.11%	2 Missing ⚠️
django_project/cplus_api/utils/api_helper.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   89.63%   92.80%   +3.17%     
==========================================
  Files          43       51       +8     
  Lines        1032     1446     +414     
==========================================
+ Hits          925     1342     +417     
+ Misses        107      104       -3     

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