SF-3076 Simplify guest role sharing settings

[pmachapman]

This PR updates the sharing functionality to be configured via a simplified interface in Settings.

To achieve this, the following modifications were made to the Scripture Forge codebase:

• Implementation of a rolePermissions property in sf_project (similar to userPermissions but per role).
• Sharing of default rights-by-role via the JSON file rightsByRole.json which is loaded into TypeScript (in the RealtimeServer and Frontend) and C# (dotnet backend).
• Implementation of SFProjectRole and Operation in C# to allow permissions to be strongly typed.
  • Note: I am considering a future PR that will use DefinitelyTyped to have these data structures defined just once (in C#) then autogenerated as TypeScript enums. To stop this PR growing any further, I have not included that in this PR.
• Sharing code between ShareDialogComponent and ShareControlComponent via ShareBaseComponent.
• Organization of the MongoDB migration scripts into the directory mongodb/Migrations/
• Improved test coverage of related code, and fixed erroneous Realtime Server unit tests.

These changes have made this PR considerably larger than originally envisaged, but the goal is a simplification and unification of permission calculations which should make future PRs with permissions simpler.

Notes

• Before running this code, you will need to run the MongoDB migration script mongodb/Migrations/20241127-AddCreatedByRoleToShareKeys.mongodb

Design Mock Up

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.62%. Comparing base (9b92c3e) to head (871c558).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2858      +/-   ##
==========================================
+ Coverage   79.19%   79.62%   +0.43%     
==========================================
  Files         533      535       +2     
  Lines       30962    31063     +101     
  Branches     5052     5063      +11     
==========================================
+ Hits        24520    24735     +215     
+ Misses       5668     5556     -112     
+ Partials      774      772       -2     

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