Cleaning up dead code

[Theodlz]

Jokes aside, this PR does a few things:

• remove a lot of unused imports
• remove some unused methods
• introduce numba to speed-up methods that can be speed up as is (some refactor could allow us to use it in many more functions
• lint some files
• remove unused arguments from some methods
• remove a bunch of unused variables within methods

The reviewer should carefully test this, but the changes should be very minimal

[Theodlz]

@mcoughlin any idea why the CI doesn't run by default?

[Theodlz]

btw might want to retire 3.8 testing in favor of 3.12, or just add 3.12

[Theodlz]

tests not working locally either (incorrect imports of MOCpy in a few places). Fixing it rn

[Theodlz]

I found myself having to remove a lot of stuff that did seem relevant in gwemopt.io.read_skymap(), because it was creating this moc_keeps variable to pass to mocpy's MOC.probabilities_in_multiordermap() in gwemopt.tiles.compute_tiles_map(), except that MOCpy doesn't take that as an argument anymore?

A little odd, not sure what it does

[mcoughlin]

moc_keeps was originally intended to track which pixels we should always observe, even in case of incrementing the telescopes where we observe and then remove a region. However, I don't think we really use it, so it could be safely ripped out.

[Theodlz]

@mcoughlin any idea why the CI doesn't run by default?

let me know if you've experienced that before, no idea how to fix it

[Theodlz]

ok some unexistent CI runs where set in the branch rules. Removed that but still not running. Looks like there is a schedule set in the CI, maybe that's why? Like it only runs it at a specific time so these can't run?

[mcoughlin]

Idk I would have thought I copied this from skyportal but @robertdstein had tried to improve this.

[Theodlz]

ah... github had turned off the CI on this repo for lack of activity... except it's not really clearly flagged...

[Theodlz]

Had to resolve some conflicts with main @mcoughlin, and some of them deleted some code which I didn't, so might want to look at my latest commit to double check that. Otherwise, this should be mergeable once green :)

[mcoughlin]

@Theodlz sorry a few more conflicts maybe.

[Theodlz]

@mcoughlin should be all good now

[mcoughlin]

Thanks @Theodlz