Async Python API

[davidbrochart]

The high-level Python API has e.g. an install function, which can take quite a lot of time. On the other hand, it's doing a lot of IO to download files. If the installation is done in threads at the C++ level, then it could also leave the Python interpreter free do to other things. I'm wondering if we could have an async API, so that we can e.g. await install()?

[davidbrochart]

Note that this can be done outside of the mamba library, by running in a thread, for instance using anyio's to_thread:

import asyncio
from anyio import to_thread
from mamba.api import create

async def main():
    await to_thread.run_sync(create, "my_env", ("attrs", ), ("conda-forge", ))

asyncio.run(main())

But I think it makes sense to have it in mamba, because it could handle parallel installations. I guess things could go wrong with this example code if several tasks run concurrently?