HSD Application Creation via API

[evomimic]

This issue is being used to track an open design question regarding how the hsd application instances can be automatically created upon acceptance of an offer.

In the current (Go) implementation of holochain, app creation functions (create and clone) are only invokable from the Command Line Interface (CLI). I understand such functions may have a callable API in the Rust holochain implementation. Need to revisit what's possible here once the Rust API's become available.