Expand analyzers project to provide codefixes to build out the API endpoint

[kswoll]

Right now it's a real pain to create a new API endpoint. We should allow you to define one of the classes (probably the interface) and then provide a codefix that will do the rest of the work:

• Create the new API implementation in the correct folder location (see https://stackoverflow.com/questions/27945891/how-to-create-a-new-class-in-a-codefixprovider)
• Add the new route to the Routes class. This one will probably require extensive interrogation of the provided implementation, and we will need some way to definitely mark the correct class (if more than one exists). For that we would ideally leave the cursor where the user would supply the route path so they could fill that in. From that point, everything should compile and actual implementation logic can proceed from there with minimal fuss except creating the original interface.

[kswoll]

One problem to solve with updating the Routes class is it'd be ideal after you apply the code fix for the cursor to be set to update placeholders for both the type (GetRoute, PutRoute, etc.) and the route path. Not sure if that's possible. For an initial implementation it'd be fine to just put in an uncompilable placeholders for the HTTP method. But definitely don't just default to GET or something because then you'd be setting things up for mistakes.