Move to idea formatter

[fikovnik]

I find the google fmt plugin quite bad, since everyone is using intellij and we have diffplug/spotless#2020, why not to use idea formatter?

[Jakobeha]

That's fine with me

If you change the formatter, please add the commit that reformats everything to .git-blame-ignore-revs, see https://gist.github.com/kateinoigakukun/b0bc920e587851bfffa98b9e279175f2.