feat: add support for codeblock on iOS

[kacperzolkiewski]

Summary

Add support for codeblock.

Test Plan

Run Example app and play with codeblock

Screenshots

Compatibility

OS	Implemented
iOS	✅
Android	✅ (already handled that way)

[szydlovsky]

Getting there!

[szydlovsky]

Incredible work! Looks and functions really well 🔥

[exploIF]

Functionally it works well, however, I've noticed one issue. When you press backspace at beginning of the line it should remove style rather than go to previous line. I believe it should work the same as it works for block quote currently

Simulator.Screen.Recording.-.iPhone.17.Pro.-.2025-11-24.at.14.18.21.mov

[kacperzolkiewski]

@exploIF we decided with @szydlovsky that when you press backspace it will go back to the previous line, it is expected behavior. When you look how for example Slack works with codeblock it works like that.

[szydlovsky]

Also, this way backspacing inside of a codeblock lets you just move stuff inside it instead of separating it into two codeblocks because style got removed for the line.

[exploIF]

@kacperzolkiewski @szydlovsky So, this means that we also have to adjust that on Android, right now it's inconsistent