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 any stable releases, It has been closed.

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
Can this test be modified to do something more substantial than e.g. `--version` or `--help`? See `cmake.rb` for an example of an application formula with a good test and `tinyxml2.rb` for an example of a library formula with a good test. Thanks!