cli: add `--allowed-mip-versions` option to restrict MIP version

cli: add `--allowed-mip-versions` option to restrict MIP version

Introduce a new "--allowed-mip-versions=VER" command line argument
to babeltrace2. By default, versions 0 and 1 are allowed (prior behavior
before this patch). It allows specifying that either version 0 or 1 are
to be allowed in the graph. Its main purpose is for testing
implementation of plugin components interactions for specific MIP
versions.

Philippe's changes to the original patch:

‣ Use `--allowed-mip-versions` instead of `--allowed-mip-version`: in
  the future we might want to make it possible to specify more than one
  version, for example `--allowed-mip-versions=0,1,5` or even
  `--allowed-mip-versions=0-2,5`.

  The current single-version format is to be considered an initial,
  temporary limitation.

‣ Use the short option `-m` for `--allowed-mip-versions`.

‣ Sort options alphabetically by long name in the output of `--help`.

‣ Updated the manual pages.

Change-Id: I1c9f74176f6686ec560ede2494b89e28f35da6a6
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12792
Tested-by: jenkins <jenkins@lttng.org>