DEV: Add .git-blame-ignore-revs to ignore style in blame view

Add a git blame ignore-revs file to automatically ignore commits listed
in it from the blame view on GitHub. Include in it style changes added by
pre-commit hooks which touch multiple files.

To ignore the commits in the .git-blame-ignore-revs when running `git blame`
locally run: `git blame --ignore-revs-file .git-blame-ignore-revs`.

c.f.:
* https://git-scm.com/docs/git-blame#Documentation/git-blame.txt---ignore-revs-fileltfilegt
* https://docs.github.com/en/repositories/working-with-files/using-files/viewing-a-file#ignore-commits-in-the-blame-view

Author: matthewfeickert

.git-blame-ignore-revs

@@ -0,0 +1,8 @@
+# style: end-of-file-fixer pre-commit hook
+c1a33a481b9c2df605bcb9bef9c19fe65c3dac21
+
+# style: trailing-whitespace pre-commit hook
+213061c0804530d04bbbd5c259f10dc8504e5b2b
+
+# style: check-docstring-first pre-commit hook
+046533797725293dfc2a6edb9f536b25f08aa636