fix: disable library code signing

[tyrauber]

Description

Fixes #442, XCode Archive : MapLibre.xcframework-ios.signature” couldn’t be copied to “Signatures” because an item with the same name already exists

Library code signing causes issue for both react-native and expo usage. In the past we had a build phase in the expo plugin to remove the *.signature file, but that was wed to xCode 15. Now with 16., the plugin doesn't work. Additionally, for react-native apps the developer must personally remove the *.signature.

It's a pain in the ass. Let's just disable code signing of the library and call it a day.

Checklist

• I have tested this on a device/simulator for each compatible OS
• I formatted JS and TS files with running yarn lint:fix in the root folder
• I have run tests via yarn test in the root folder
• I updated the documentation with running yarn generate in the root folder
• I mentioned this change in CHANGELOG.md
• I updated the typings files (index.d.ts)
• I added/updated a sample (/example)