Implement Group sync for KeeShare

[droidmonkey]

Originally contributed through #9778, code provided by @evur

Fixes #3045

Screenshots

Testing strategy

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)
• ✅ New feature (change that adds functionality)

[codecov]

Codecov Report

Attention: Patch coverage is 20.51282% with 31 lines in your changes missing coverage. Please review.

Project coverage is 63.86%. Comparing base (dff5f3b) to head (06f9ab6).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/keeshare/ShareExport.cpp	0.00%	25 Missing ⚠️
src/keeshare/group/EditGroupWidgetKeeShare.cpp	33.33%	6 Missing ⚠️

❌ Your patch check has failed because the patch coverage (20.51%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11593      +/-   ##
===========================================
- Coverage    63.92%   63.86%   -0.06%     
===========================================
  Files          369      369              
  Lines        38924    38953      +29     
===========================================
- Hits         24880    24877       -3     
- Misses       14044    14076      +32     

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[droidmonkey]

I fixed up the code, but this does break existing behavior since recursing is off by default. Need to think about whether to send this out with 2.7.10 or not.

[droidmonkey]

This needs to be adjusted so the current behavior is retained as the default behavior.

[droidmonkey]

Deferring this to 2.8.0