Abstract routing API sorts routes.

[BorekZnovustvoritel]

Fixes #1879.

Changes proposed in this pull request:

• This PR is based on comments in PR Sort routes in RoutingMiddleware #1898
• Fix moved from RoutingMiddleware to AbstractRoutingAPI

Let me know if anything else needs adjustments.

[dkoston]

Just an FYI that I've confirmed this fixes routing bugs in connexion that exist today.

For example, attempt to add these 2 routes:

paths:
 /users/{user_id}:
    get:
 /users/accept:
   get:

In 3.1.0 GET /users/accept is routed to GET /users/{user_id}

Not sure if there's more needed in this PR to get it merged but we've had to fork connexion until it will be as AsyncApp broke our routing.

LMK if I can help out with some test cases or whatever to get this rolling.

CC: @RobbeSneyders

[coveralls]

coverage: 94.153% (+0.003%) from 94.15%
when pulling 8111037 on BorekZnovustvoritel:sort-routes-api
into 7c4fcc4 on spec-first:main.

[RobbeSneyders]

@dkoston adding a test would be very much appreciated and will prevent us from accidentally breaking the behavior in the future.

[dkoston]

@RobbeSneyders is there any documentation on how to run the test suite?

I added some tests but running the lines from .github/workflows/pipline.yml results in
almost all tests failing even though I haven't changed any code other than adding a test.

pip install --upgrade pip
pip install "poetry<2" "tox<4" "tox-gh-actions<3" "coveralls<4"
tox