Allow aliasing parameters for better reusability

[ire4ever1190]

Can now use CtxParam to alias a name + type

e.g.

type
  AuthHeader = CtxParam["Authorization", Header[string]]

Now AuthHeader can be used and it will automatically use "Authorization" as the name

e.g.

# No need to do {.name: "Authorization".} since it already knows thats its name
"/secrets" -> get(auth: AuthHeader):
  # stuff