Support typescript config modules

[mearns]

As a user
I want to be able to write my config module in typescript
so that I can benefit from the type-checking and the published sirocco config type definitions.

Acceptance Criteria

• Sirocco can load config from a file named .sirocco.ts, parsed as typescript including any other imported modules and using tsconfig.json if present.

References

The virtual-tsc project might be what we're looking for, but I'm not sure.

You might also start here: Using the Compiler API. There's also a lot of details here including what looks to be a CompilerHost implementation, which is the thing that gets files off the "filesystem", so that might be useful for keeping everything in memory if necessary.