ci: taplo fmt check for TOML files

[sergerad]

Closes #644

• Add taplo commands to Makefile
• Add taplo job to lint.yml
• Diffs from running taplo fmt locally

[Mirko-von-Leipzig]

Thanks @sergerad; I appreciate you picking this up :)

Could you rebase this to target the next branch? We use next as our dev branch (see here).

[Mirko-von-Leipzig]

@bobbinth in terms of styling, are there any options that catch your eye?

I propose adding a .taplo.toml configuration file with the following non-defaults:

[formatting]
align_entries = true    # This might not be nice; will have to judge after I see it.
column_width = 120
reorder_keys = true
reorder_arrays = true
reorder_inline_tables = true

Mostly just alphabetical ordering to ensure consistency. Might end up looking bad; note that deps could still be grouped together via newlines.

Something else that's nice is that taplo provides an LSP which is nice for dev work.

[bobbinth]

@bobbinth in terms of styling, are there any options that catch your eye?

I think the ones that you've listed make sense and I didn't see anything else that I'd add.

[Mirko-von-Leipzig]

Just the one small change; the rest looks great