[iOS] Handle paste and key commands

[aringenbach]

• Add an API to delegate items paste handling to the hosting application.
• Add an API to allow the hosting application to override some key commands behaviour (e.g. press enter to send a message) => This could be expanded further in order to handle delete word / delete line for iOS user using a physical keyboard if the default behaviour needs improvement.

Unfortunately I couldn't build some UITests for this bit because the key input API for XCTest is only available for a MacOS environment and not for iOS. Will come back with some tests for this later if I find something useful.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

Patch coverage: 61.06% and project coverage change: -0.21% ⚠️

Comparison is base (bae7710) 90.07% compared to head (24fc26b) 89.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #759      +/-   ##
==========================================
- Coverage   90.07%   89.86%   -0.21%     
==========================================
  Files         112      113       +1     
  Lines       16137    16237     +100     
  Branches      565      612      +47     
==========================================
+ Hits        14536    14592      +56     
- Misses       1580     1624      +44     
  Partials       21       21              

Flag	Coverage Δ
uitests	80.63% <61.06%> (-1.71%)	⬇️
uitests-ios	80.63% <61.06%> (-1.71%)	⬇️
unittests	88.47% <12.38%> (-0.53%)	⬇️
unittests-ios	75.51% <12.38%> (-4.96%)	⬇️
unittests-rust	89.83% <ø> (ø)

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

Files Changed	Coverage Δ
...mponents/WysiwygComposerView/WysiwygTextView.swift	82.64% <51.42%> (-12.71%)	⬇️
...ents/WysiwygComposerView/WysiwygComposerView.swift	78.67% <52.27%> (-12.91%)	⬇️
...WysiwygComposerView/WysiwygComposerViewModel.swift	92.54% <82.35%> (-0.59%)	⬇️
...WysiwygComposer/Components/WysiwygKeyCommand.swift	82.35% <82.35%> (ø)

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[alfogrillo]

Don't have much context yet.
But the code LGTM!