Plugin(matchPlugin): Get our functions to actually work with `Bot`

Previously we added the `Bot` monad to our signature, but we didn't have
a way to filter and match plugins wrapped in the `Bot` monad. This is
what we're doing here. It's the same work as before, but we need to
account for a wrapped `Plugin` type.

There's a lot of extra cruft code here from when I was trying things out
to get it working. The short story is that I do some binding and
sequencing dances to extract `Plugin`s so that we can actually match
against them.

I've seen recommendations against `fail`, which is why I tried to use
`mzero`, but it just seemed to be too complicated so went with `fail`,
which seems to make sense in context.

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