Adds our own hook for before/after logic that's more usable, called
`ITestMethodLifecycle`. This provides access to a context object
including the information about the test and the output helper. This can
be implemented by attributes or by the class itself.
The goal (and result) of this, is that we have a single *test executor*
extensibility point that provides all of the features we need. We should
use this everywhere we need features xUnit doesn't have.
Adding a new extensibility point (`ITestMethodLifecycle`) allows us to
do this without turning all of these features into a giant monolith.
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Also updated our existing extensibility to use this new hook.
I did as much cleanup as a could to remove duplication from logging and
keep it loosly coupled. I didn't want to tease this apart completely
because the scope of this PR is already pretty large.
Ryan Nowak
Justin Kotalik
Justin Kotalik
Nate McMaster