Integrate COG writing logic from odc-geo

[Ariana-B]

As part of ODC 1.9 integration, we want to shift towards using odc-geo where possible.
Replace the COG writing code implemented here with the logic from odc-geo - this removes the need for the FileWrite and GridSpec classes.

[omad]

Oh nice!

Core doesn't use eo-datasets though does it?

So this isn't necessarily required for 1.9? but is likely to break downstream applications like odc-stats?

[Ariana-B]

Oh nice!

Core doesn't use eo-datasets though does it?

So this isn't necessarily required for 1.9? but is likely to break downstream applications like odc-stats?

Not required by core 1.9, no, just in line with the push in 1.9 to make sure we're using odc-geo instead of duplicating logic. This would indeed break odc-stats, but we should transition odc-stats to use odc-geo as a next step anyway.