Add test for hashed token router

[XAMPPRocky]

No description provided.

[quilkin-bot]

Build Succeeded 🥳

Build Id: 328b42b7-6a54-479e-9c54-4f31263c3b1d

The following development images have been built, and will exist for the next 30 days:

• us-docker.pkg.dev/quilkin/ci/quilkin:0.9.0-dev-ce8b7a2

To build this version:

git fetch git@github.com:googleforgames/quilkin.git pull/950/head:pr_950 && git checkout pr_950
cargo build

[XAMPPRocky]

Should this maybe happen through a watcher task in quilkin instead, to prevent a code path where the token maps aren't built from ever happening.

[Jake-Shadle]

Well it does create them automatically when endpoint sets are updated in a proxy, this function call is just exposed since tests/benches aren't doing the normal operation but I suppose I could change it so that they're either built like they are now, or else when accessed, the issue would be that if they're built on access in actual running code that would be expensive.

[XAMPPRocky]

Alright, I guess it's fine for now.