Fix: ASGI processes did not support lifespan events

[hoh]

ASGI specification https://asgi.readthedocs.io/en/latest/specs/lifespan.html

Fixes #293
Replaces #294

Missing

• Fastapi example uses lifetimes
• Tests validate that the startup lifetime is executed

[MHHukiewitz]

LGTM, but would like to test it out locally tomorrow

[hoh]

Needs a fix in aleph-client to work.

[hoh]

Test by accessing https://aleph-vm-lab-2.aleph.cloud/vm/test/lifespan.

Commits squashed.

[hoh]

Tests fail due to the issue in aleph-client.

[MHHukiewitz]

@hoh Is there a reason why you did not implement the same for the Debian runtime?

EDIT: Also, what's curious is that even though you did not change the Debian runtime, it also fails in the GH action (but I cannot really make out why that is, I'm still struggling with making the VM supervisor run on my machine due to Conda, duh)

[hoh]

@hoh Is there a reason why you did not implement the same for the Debian runtime?

I did. The init1.py of the Debian runtime is a symbolic link to the file I modified.

It also fails in the GH action (but I cannot really make out why that is, I'm still struggling with making the VM supervisor run on my machine due to Conda, duh)

The reason why the tests fail still need investigation.

[hoh]

This needs to be rebased due to recent changes.

[MHHukiewitz]

Any idea why the tests might be failing?

[odesenfans]

Lots of unrelated code, and the demo does not work.