style: format iOS code

[KiwiKilian]

I formatted the iOS code base using clang-format. It's included with Xcode and available for most other editors. I will add the commit to the .git-blame-ignore-revs directly on main after it's merged.

[tyrauber]

Can this formatting be enforced by prettier? I think having the formatting come from outside tools with a standard not maintained by the repo is problematic.

[KiwiKilian]

I tried to find something compatible with Prettier – but there seems to be nothing. So I figured this is better then having the previously completely unknown style? I can see if we can check the style on CI?

clang-format seems to be the defacto standard for Obj-C and should bring it own default style.

[KiwiKilian]

Ah, should we adopt the config from MapLibre Native? https://github.com/maplibre/maplibre-native/blob/main/.clang-format

[tyrauber]

YES! Good idea!

[KiwiKilian]

I've applied the style from MLN. I will add the config file in a separate branch.