Create ZIO versions of the ZPure functions on MorphirRuntime

[edwardpeters]

Feature Request

MorphirRuntime has a number of ZPure functions. In at least one upcoming case (unit testin'), these can only be called after the user has performed some side effecting operations to get the required inputs. It would be helpful to have ZIO versions as well to wrap this functionality, which is not something that fits into the model of ZPure

Description of Problem:

Very specifically, when calling runUnitTests, I should not have to provide the unit test framework IR myself; there should be at least one entry point that loads it for me.

Potential Solutions:

It should be fairly easy to add ZIO versions of these functions with support for file handling (esp. once cross-compiled file handling with js has been resolved)