completion: add 'git history' subcommands

Use the parse-options completion helpers for the

  git history

subcommands and their options. All current history subcommands take a
revision as their first positional argument, so complete that argument
as a revision.

Once the revision is present, leave any further positional arguments to
subcommand-specific completion. This allows a subcommand to complete
another kind of argument, such as the pathspec accepted by

  git history split

or another revision if a future subcommand accepts one.

Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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