Generate Swift Structs/Protocols from XLRs

[KetanReddy]

Using XLRs, it should be possible to generate basic Protocols/Structs from their originating Typescript types to remove manually having to create them. There are a few potential use cases for this:

• Generating stubs for Swift Player Assets from their Typescript counterparts
• Generating Swift structs/protocols for the types used in Core Player that need to be used in iOS Player.
• Potentially stubbing out iOS Plugins from their Typescript counterparts (This may require enhancements in the XLR processor to handle Typescript classes)