♻️ webserver: fixes mypy issues in groups plugin

[pcrespov]

What do these changes do?

• ♻️ refactors groups plugin in webserver
  • plugin under groups folder
  • protected internal modules
  • splits api: moves database layer to a separated module _db
  • replaces mapping OAS -> handlers by static definition of routes (added tests).
  • general code cleanup (e.g. _logger, TODO, ...)

Related issue/s

• part of Maintenance: make mypy pass in all services/packages in repo #4071
• supports Maintenance: update the schemas for group resources #3499
• supports Use new models in groups plugin #3361
• supports Maintenance: remove duplicate fixtures primary_group, stadard_groups, ... #3732
• supports ⚗️ web-server refactoring backlog #2008

How to test

cd services/web/server
make mypy | grep groups

[codecov]

Codecov Report

Merging #4209 (265f2cf) into master (75141d1) will decrease coverage by 7.0%.
The diff coverage is 93.8%.

@@            Coverage Diff            @@
##           master   #4209      +/-   ##
=========================================
- Coverage    85.9%   78.9%    -7.0%     
=========================================
  Files         866     396     -470     
  Lines       38414   20562   -17852     
  Branches      583     173     -410     
=========================================
- Hits        33025   16243   -16782     
+ Misses       5253    4270     -983     
+ Partials      136      49      -87     

Flag	Coverage Δ
integrationtests	61.9% <64.6%> (-6.8%)	⬇️
unittests	84.0% <92.6%> (+1.5%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...src/simcore_service_webserver/groups/exceptions.py	100.0% <ø> (ø)
...core_service_webserver/scicrunch/service_client.py	65.6% <66.6%> (ø)
...c/simcore_service_webserver/groups/_classifiers.py	73.0% <84.0%> (ø)
.../src/simcore_service_webserver/groups/_handlers.py	81.3% <88.0%> (ø)
...server/src/simcore_service_webserver/groups/_db.py	94.8% <94.8%> (ø)
...server/src/simcore_service_webserver/groups/api.py	96.6% <96.6%> (ø)
...erver/src/simcore_service_webserver/application.py	97.8% <100.0%> (ø)
...mcore_service_webserver/garbage_collector_utils.py	83.5% <100.0%> (ø)
...ver/src/simcore_service_webserver/groups/_utils.py	100.0% <100.0%> (ø)
...ver/src/simcore_service_webserver/groups/plugin.py	100.0% <100.0%> (ø)
... and 5 more

... and 568 files with indirect coverage changes

[codeclimate]

Code Climate has analyzed commit 265f2cf and detected 0 issues on this pull request.

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication