feat: allow inviting contact groups

[miaulalala]

Fixes #167

To Do

• Duplicate Members - create a single attendee and add the duplicate group ids to the MEMEBR property
• Does it actually send invitation emails
• use nc:groupname@group instead of mailto: prefix?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.

Project coverage is 23.72%. Comparing base (d039b91) to head (0ec05ad).
Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
.../components/Editor/Invitees/InviteesListSearch.vue	0.00%	25 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6285      +/-   ##
============================================
+ Coverage     23.54%   23.72%   +0.18%     
- Complexity      454      472      +18     
============================================
  Files           247      248       +1     
  Lines         11701    11775      +74     
  Branches       2213     2210       -3     
============================================
+ Hits           2755     2794      +39     
- Misses         8625     8661      +36     
+ Partials        321      320       -1     

Flag	Coverage Δ
javascript	15.05% <0.00%> (-0.02%)	⬇️
php	59.59% <ø> (+0.06%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.