Add get asset id utility method

[AlexanderVorobyov]

• Add AssetIdEditorUtility.GetGuid() method as shortcut to get asset guid.
• Add AssetIdEditorUtility.GetId() method as shortcut to get asset guid as GlobalId.

[AlexanderVorobyov]

Create branch from main

issue-299-add-get-asset-id-utility-method