Allow configuring iOS build with CMake

[louwers]

• Allows configuring Xcode with CMake for iOS builds.
• Add new job to ios-ci that builds the mbgl-core, ios-sdk-static and app CMake targets for iOS.
• Move some files that are implementations for the core to platform/darwin/core to better separate out the iOS SDK.
• Fix some build issues (unused/uninitialized variables).
• Add license for SMCalloutView.
• Fix typo MLN_PUBLIC_IOS_APP_SOPURCE.
• Update MapLibre Developer Documentation to reflect changes in this PR.
• Remove some unused files.
• Add CMakePresets.json. Other platforms will be added in a follow-up PR. Info here: https://martin-fieber.de/blog/cmake-presets/

[github-actions]

Bloaty Results 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  -0.0%     -24    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results/pr-3234-compared-to-main.txt

Compared to d387090 (legacy)

    FILE SIZE        VM SIZE    
 --------------  -------------- 
   +31% +36.2Mi  +438% +26.2Mi    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results/pr-3234-compared-to-legacy.txt

[github-actions]

Benchmark Results ⚡

Benchmark                                                     Time             CPU      Time Old      Time New       CPU Old       CPU New
------------------------------------------------------------------------------------------------------------------------------------------
OVERALL_GEOMEAN                                            -0.0013         -0.0016             0             0             0             0

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/benchmark-results/pr-3234-compared-to-main.txt

[github-actions]

Bloaty Results (iOS) 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +8  [ = ]       0    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results-ios/pr-3234-compared-to-main.txt

[TimSylvester]

I had to upgrade to the latest CMake, maybe the cmake_minimum_required should be increased?

The Team ID QMC7N4BDVZ is embedded in platform/ios/app/CMakeLists.txt. I guess that needs to come from a config file like config.bzl or environment variable.

[louwers]

@TimSylvester Yes if you use the CMakePresets.json you need CMake 3.31.

@TimSylvester That's the one on CI. Yes I'll fix that.