KatipContextT Example with MonadLogger Support

[jkachmar]

I've run into a few situations where having a MonadLogger orphan instance for KatipContextT has been helpful to interface with libraries that only export that interface for logging (so far, it's mainly been useful when interfacing with Persistent).

I've seen a few comments before about this in issues, or in other repos, but it usually takes a little work to find an example to go off of if you're not sure where to look.

If I extracted something small for a PR to the examples directory, would that be welcome here?

[MichaelXavier]

You may want to take a look at #27

Someone there did some work on a separate package that provides this and I think I'd prefer this be in a second package (which I'll happily promote in the readme or wherever else makes sense when it's released) to avoid bringing in dependencies that aren't frequently required.