Make columns re-orderable

[AlekLefebvre]

Fixes #1584, #2717, #2718, #2722

Fixes the critical regressions caused by #2213 and reverts #2731

Technical details
I had to convert the columnOrder to string[] inside mathesar_ui/src/systems/table-view/header/Header.svelte to fix #2722 and because of issues working with a "string[] | number[]" type.

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[seancolsen]

I spent a few hours with this today and couldn't spot any remaining issues. I fixed a merge conflict and pushed 6b6066a with some minor code cleanup.

[seancolsen]

@pavish Would you be interested in giving this a second look before we merge it?

[pavish]

@AlekLefebvre I've kept the review/merge on hold since we are close to a release. This is on my tasklist and I will get this PR merged once we freeze our release branch for 0.1.2. This should be in a couple weeks.

[pavish]

@AlekLefebvre This looks great!

Sorry for taking so long to get this merged in, we had a release pending and I wanted to wait until we had it out, and I was on vacation for a while after that.

Thank you for your effort!