feat: optimize state transitions

[brianmay]

Note there are three distinct changes, each one is a separate commit.

1. Don't enter "trying to sleep" when power > 0.
2. Cancel an ongoing suspended state/trying to sleep if power > 0.
3. Add conditions for entering charging mode.

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[brianmay]

Tests pass on my box :-)

Hope I have read @micves comments on this correctly. #4453 (comment)

[brianmay]

This was split on from #4453

[JakobLichterfeld]

lgtm.
I love how you fillet big changes into small happens

[JakobLichterfeld]

@micves May I ask you to review as well?

[micves]

Hope I have read @micves comments on this correctly. #4453 (comment)

Nice work, its spot on :)

@micves May I ask you to review as well?

Yes, lgtm and approved 👍

[brianmay]

I love how you fillet big changes into small happens

Have been looking at Jujutsu, which makes this sort a log easier then plan git.

There is a lot of youtube videos, blogs, etc on jujutsu, mostly positive opinions. Home page is https://jj-vcs.github.io/jj/latest/

There is a learning curve though. It does some fundamental things very differently to git, which is very likely to catch you by surprise if you are use to git (apparently these come from Mercurial).