Migrate to true asyncronous Tango Devices

[DomPTech]

I learned that inside Tango devices you can set

green_mode = GreenMode.Asyncio

This will allow us native Tango support for asynchronous functions, which is especially helpful for the LLM Device (which is asynchronous in nature). And of course then this repo can finally live up to its name

[utkarshp1161]

I agree with this issue.

Typically there might be some manufacture-api constraints on async-use of hardware parts. But doesnt hurt trying.

My experience on the AustoScript API is : We can do EDX acquisition parrallel to HAADF acquisition. Also stage can be moved while Beam is scanning.

@gduscher, @AustinHouston Do you have a workflow/use-case in mind?

[DomPTech]

That's a good thought. I did a little digging and the Autoscript API itself is synchronous, so calling it normally would freeze the Tango device's event loop. We could overcome this by using some asyncio methods and locks but it would add a lot overhead when writing commands.

For devices like the LLM where the underlying API is asynchronous, it is much simpler. But it should be definitely doable for the microscope as well.