Add flowmi strainers

[fderop]

Flowmi produces neat strainers that you can put on a pipette tip. I want to implement this in PLR. I think we could reuse a lot of code from TipRack, but I'm not sure what the best procedure would be to do the actual pickup motion. Any suggestions? The normal use case would be:

1. Pick up tip
2. Aspirate something
3. Pick up a flowmi strainer
4. Dispense
5. Discard

[rickwierenga]

i think this can be a method on LH, pick_up_stainer. This can use the move_channel_{x,y,z} of the backend.

[rickwierenga]

can i close this?