Add primary associated type to HBRouterMethods

[sidepelican]

I want to use it like Vapor's RouteCollection, so I need the primary associated type to be able to write the following

struct MyController {
    func boot(routes: some HBRouterMethods<MyRequestContext>) {
        routes.get("foo", use: getFoo)
        routes.post("foo", use: postFoo)
    }

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0b33c97) 84.51% compared to head (a11e337) 84.51%.
Report is 1 commits behind head on 2.x.x.

Additional details and impacted files

@@           Coverage Diff           @@
##            2.x.x     #378   +/-   ##
=======================================
  Coverage   84.51%   84.51%           
=======================================
  Files          95       95           
  Lines        5283     5283           
=======================================
  Hits         4465     4465           
  Misses        818      818           

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[adam-fowler]

Fair enough
Of course you can't add middleware, but then you probably shouldn't be allowed to as it would affect routes outside of the controller.