Add a developer option for history sharing on invite

[richvdh]

Adds a new developer flag, enabling our experimental support for MSC4268.

Part of element-hq/element-meta#2871. Requires matrix-org/matrix-rust-sdk#5141, so won't build yet. An equivalent to element-hq/element-x-android#4821.

[github-actions]

	Warnings
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against f19196f

[richvdh]

This is draft for now pending a release of matrix-sdk including matrix-org/matrix-rust-sdk#5141, but:

Please note I lack Apple hardware, so this is completely untested. I figured this would give someone who knows what they are doing a place to start.

[stefanceriu]

This looks great, thank you @richvdh!
Presumably we can go ahead and merge this as soon as a new SDK version is available, right?

[richvdh]

Yup, hope so!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 79.15%. Comparing base (db3f9f4) to head (f19196f).
Report is 1 commits behind head on develop.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...perOptionsScreen/View/DeveloperOptionsScreen.swift	0.00%	10 Missing ⚠️
...s/Authentication/AuthenticationClientBuilder.swift	0.00%	2 Missing ⚠️
...ources/Services/UserSession/UserSessionStore.swift	0.00%	2 Missing ⚠️
...mentX/Sources/Other/Extensions/ClientBuilder.swift	0.00%	1 Missing ⚠️
NSE/Sources/NSEUserSession.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4172      +/-   ##
===========================================
+ Coverage    79.13%   79.15%   +0.01%     
===========================================
  Files          820      820              
  Lines        75051    75065      +14     
===========================================
+ Hits         59393    59417      +24     
+ Misses       15658    15648      -10     

Flag	Coverage Δ
unittests	71.27% <0.00%> (+0.04%)	⬆️

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