Add progress info in west update command

[yvesll]

HI, it would be helpful if we can know the progress when update lots of repos under a big project.
tqdm provides a beautiful bar but it seems not compatible with west's log module.
A simpler way like [1/99] is also good.

[pdgendt]

This could go hand in hand with parallel updates, I want to tackle that in a future release.

I'll try and gather these issues in a v2.0.0 milestone and look into those after the v1.3.0 release.

[marc-hb]

As discussed a bit in #301, git progress comes directly from git and west does not know anything about it (ignoring the fact the timing of git's progress bar can be jumping around as bad as the typical progress bar).

This could go hand in hand with parallel updates, I want to tackle that in a future release.

BTW there's been a LOT of water under that bridge, here's one entry point:

• project.py: Add new 'joblib' dependency to parallelize update #713