Format all cmake files. (pytorch#3498)

Summary:
Pull Request resolved: pytorch#3498

Let's add a `.cmake-format.yaml` and run it over all our cmake files:
`find . \( -name 'CMakeLists.txt' -o -name '*.cmake' \) -exec cmake-format {} -i \;`

`dangle_parens` is needed to put the closing parenthesis on a new line, since we've been doing that most of the time manually.

Reviewed By: dbort

Differential Revision: D56896610

fbshipit-source-id: b48a818cf44c182df7c8461dd10d62cdc01447a9

.cmake-format.yaml

@@ -0,0 +1,2 @@
+first_comment_is_literal: true
+dangle_parens: true