[iOS] Introduce support for linking ICU libs

[mkhamoyan]

After #93220 we only support hybrid mode on Apple platforms.

Below are the steps to implement support for linking our ICU libs.

• Move out globalization code from mono runtime
• Create separate lib for hybrid (System.Globalization.Hybrid.Native)
• Enable the functionality to toggle between hybrid and ICU libraries
• xamarin-macios and android should be needing to link againstlibSystem.Globalization.Native

Contributes to #80689

Tagging subscribers to 'os-ios': @steveisok, @akoeplinger, @kotlarmilos
See info in area-owners.md if you want to be subscribed.

Issue Details

---

After #93220 we only support hybrid mode on Apple platforms.

Below are the steps to implement support for linking our ICU libs.

• Move out globalization code from mono runtime
• Create separate lib for hybrid (System.Globalization.Hybrid.Native)
• Enable the functionality to toggle between hybrid and ICU libraries

Contributes to #80689

Author:	mkhamoyan
Assignees:	-
Labels:	area-System.Globalization, os-ios
Milestone:	-

[mkhamoyan]

After #93220 HybridGlobalization is default and only mode.
Moving out globalization code from runtime is implemented by #98495