Add initial "b4 pr" command set

While working on "pull-request exploder" stuff for achiving on
lore.kernel.org, I realized that this may be a useful set of features
for developers as well, so here is a very simple framework for handing
pull requests. Examples:

b4 pr <msgid>

  - downloads that message
  - parses the pull request
  - checks that the remote tip is where the message says it should be
  - makes sure the base-commit is present in the tree
  - makes sure the tip commit isn't already in one of the branches
  - checks if FETCH_HEAD already is at that commit
  - if the above two checks pass, performs a git fetch

b4 pr --check <msgid>

  Runs all of the checks above, but doesn't perform the actual fetch.
  Useful if you don't remember if you've already processed a pull
  request or not.

b4 pr --explode <msgid>

  Runs basic sanity checks and then:

  - performs a git fetch
  - runs a "git format-patch" for base-commit..FETCH_HEAD
  - adds the same to/from/cc headers as in the pull request
  - properly threads each patch below the pull request
  - saves that into a <msgid>.mbox file

  The above is handy if you want to comment on something in a pull
  request and not have to hunt around for sender/cc information.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

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