feat: Interactivity v0.1 integration

[samuelOsborne]

This PR adds support for v0.1 of interactivity 🎉

If your .lottie contains a state machine configuration you can load it via its id using loadStateMachine

New functions available:

• loadStateMachine(id: String) -> Bool
• startStateMachine() -> Bool
• stopStateMachine() -> Bool
• postEvent(event: Event) -> Bool
• stateMachineSubscribe(oberserver: StateMachineObserver) -> Bool
• stateMachineUnSubscribe(oberserver: StateMachineObserver) -> Bool
• stateMachineFrameworkSetup() -> [String]

Other:

This PR also fixes issue #16

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Latest commit: 61ceea7

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[afsalz]

Looks good 🚀