Add fourmolu

[martijnbastiaan]

Rebasing on top of this PR

Rebase on commit before this PR:

git fetch
git rebase f7bfc6c2cd2d9d9789c0a03327eb9b6d5ed96a2c

Finish rebase like normal. Then rebase on top of this PR (+fallout PR):

git rebase 94786b2c0bf501203b41adae367b4a416d8902b4

If you get a merge error during a rebase do:

git checkout --theirs <file1> <file2>

This throws away any changes this PR made (which are mechanical). Then to format your files:

git add -A
format

And continue the rebase like normal.

Finally, rebase on top of staging:

git rebase origin/staging

Repeat this PR

git reset $(git log --grep="Add fourmolu" --pretty=format:"%H") --hard
git rebase origin/staging
format
format # idempotence bugs wohoo
git commit -am "Format files using fourmolu" -m "Closes #548"

echo "# SPDX-FileCopyrightText: 2024 Google LLC"                  >  .git-blame-ignore-revs
echo "#"                                                          >> .git-blame-ignore-revs
echo "# SPDX-License-Identifier: CC0-1.0"                         >> .git-blame-ignore-revs
git log --grep="Format files using fourmolu" --pretty=format:"%H" >> .git-blame-ignore-revs
echo ""                                                           >> .git-blame-ignore-revs
git add .git-blame-ignore-revs
git commit -m "Ignore formatting commit for blame"

[lmbollen]

Wow nice diff