WIP: Add AsyncRunner.block()

[basnijholt]

Description

Allow to block the AsyncRunnner until it is complete.

Unfortunately, this requires nest_asyncio because python/cpython#93462.

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• (Code) style fix or documentation update
• This change requires a documentation update

[basnijholt]

Superseded by #444