New formula: fb-adb

fb-adb is a tool for interacting with Android systems. It does much of
what adb does, but with better remote shell support and, hopefully,
fewer bugs.

I had submitted a pull request #31555. Because fb-adb didn't have
stable releases, It has been closed.
https://github.com/Homebrew/homebrew/pull/31555

I had submitted this PR on homebrew-headonly.
https://github.com/Homebrew/homebrew-headonly/pull/58

Now fb-adb has a first tagged version, fb-adb 1.2.0. So I just made
another pull request for this version of fb-adb.
https://github.com/facebook/fb-adb/issues/4