Encode the style URL in iOS

[qqz003]

For iOS versions under 17.0, [NSURL URLWithString:] cannot create an NSURL object with the url string that containing any characters that need to be encoded. Consequently, it cannot load the custom style correctly if the style file contains such a URL.

[louwers]

Please add a unit test to http_file_source.test.cpp.

[github-actions]

Bloaty Results (iOS) 🐋

Compared to main

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +392  [ = ]       0    TOTAL

Full report: https://maplibre-native.s3.eu-central-1.amazonaws.com/bloaty-results-ios/pr-2965-compared-to-main.txt

[qqz003]

Please add a unit test to http_file_source.test.cpp.

@louwers
The method resourceURL is not defined in http_file_source.hpp; it's only used for Apple platforms. So, maybe it's better to add the test to the class MLNResourceTests? However, I didn't find how to run the Darwin tests. They don't appear in the test navigator of Xcode, and I didn't find the related workflow (maybe included in some other workflow?).

[louwers]

@qqz003 Yes that sounds good.

The ios_test test target should include this test.

[qqz003]

@louwers Looks that I don't have the write access to merge the PR, could you please help to merge it? Thank you!

[louwers]

@qqz003 Thanks for the reminder!