FindInvokedFunction is a helper method which loads all available functions, checks the incoming event and returns the function to be invoked via the RPC invoke event, or nil if a function is not being invoked.

Initialize creates a new funciton run identifier for the given workflow and event, stores this in our state store, then enqueues a new function run within the given queue for execution.

NewTracker returns a crappy in-memory tracker used for registering function runs.

WithTracker is used in the dev server to track runs.

Runner is the interface for the runner, which provides a standard Service and the ability to re-initialize crons.