[v1.2.183-pr.1] Add iOS Editor.asmdef file to upm package

Added upm/Editor/<version>/iOS/ExternalDependencyManager.Editor.iOS.asmdef definition file, in order to avoid Unity IOS .dll files missing errors, like described below:

Unity console

Assembly 'Packages/ExternalDependencyManager/Editor/<version>/Google.IOSResolver.dlll' will not be loaded due to errors:
Unable to resolve reference 'UnityEditor.iOS.Extensions.Xcode'. Is the assembly missing or incompatible with the current platform?

This usually happens when you didn't install iOS Build Support module, or you are trying to build from Unity Editor on Windows/Linux platforms.

Issues

• googlesamples#622
• googlesamples#412

Related PR's

• googlesamples/Fix IOSResolver platforms. Use only on mac #691

PS: The -pr suffix on tag mfdeveloper/unity-jar-resolver#v1.2.183-pr.1 means "pre-release", because it's a custom fix before github.com/googlesamples release the version 1.2.183. However, it's a stable and you can add it to your Unity project 😄

Full Changelog: v1.2.182...v1.2.183-pr.1