Support wildcard route matching for integrations

[ChristianPavilonis]

Allows integrations to easily proxy any request matching a wildcard pattern to downstream apis.

This is needed for #108 and #123 to work and pass their api calls through trusted server without needing exact matches for every call.

• Uses matchit crate for fast route matching.
• adds helper methods for defining endpoints under a namespace
  • but still allow integrations like prebid to customize the route

[aram356]

🔧 Please look into eliminating loop

Option 1: Integration should register a prefix that would match to
Option 2: Maybe we can take advantage of https://docs.rs/matchit/latest/matchit/

[aram356]

👍 Look good.