Revert "Revert "Added an adapter for FastAPI""

[jensens]

Original: #216
Reverts #228

[jensens]

looks like we need this PR fixed first authomatic/liveandletdie#15

[mrichar1]

Some minor updates to the fastapi functional_test app to get it working. This works when run manually via uvicorn --app-dir authomatic/examples/fastapi/functional_test/ main:app --host 127.0.0.1 --port 443 --reload which matches what test_providers calls.

However uvicorn is running this with scheme http which causes everything to still fail. Looking at the config, it appears we need to pass in a keyfile and certfile with the command-line params --ssl-keyfile TEXT --ssl-certfile TEXT.

Currently the liveandletdie code generates temporary certs for Pyramid (WSGISimpleServer) but the code relies on generating and using them in the same place inside a with tempdir block. Need a better way to handle this for fastapi when the code is returning the command to be run, and control of the tempdir would be 'lost'.