[2.0] Re-organize acquisition around channels

[dbirman]

Is your feature request related to a problem? Please describe.
We want to re-organize acquisition to be organized by imaging channels instead of tiles

Describe the solution you'd like

• Channel is the main feature of an acquisition
• Tile deprecated
• Upgrader from v1.X tiles to v2.0 channels

Describe alternatives you've considered
@saskiad additional details probably needed before someone tackles this

Additional context
Note, depends on #1173

https://alleninstitute.sharepoint.com/:w:/r/sites/NeuralDynamics/_layouts/15/Doc.aspx?sourcedoc=%7BE27B889D-27A1-4CC0-948C-10ADBE605654%7D&file=Data+Schema+2.0.docx&action=default&mobileredirect=true&DefaultItemOpen=1

[saskiad]

Channel:

• emission information needs to be more specific. current version is based on emission filters being in a wheel, so the wheel index tell us the emission wavelength, etc. I think that should be contained here
• Channel is used for in vitro imaging (acquisition) but also in vivo (ophys) imaging, so need to make sure it works for both of those
• Might need to be a base Channel class and then a few child classes. (e.g. the dilation only applies to slap, so it could be a slap channel thing).

Tile/Acquisition Tile:

• Don't deprecate these, but remove the channel field from the acquisition tile

In acquisition:

1. add a channels field that is a required list. This uses a Channel object that has the base channel info (above) plus a lit of acquisition tiles.
2. Remove the tiles from acquisition class