Write a script to install git tools and hooks

changed milestone to %Tor: 0.4.4.x-final

added actualpoints::.1 component::core tor/tor milestone::Tor: 0.4.4.x-final owner::nickm priority::medium resolution::fixed reviewer::teor severity::normal status::closed type::enhancement labels

See branch ticket33451 with PR at https://github.com/torproject/tor/pull/1764 .

I've tried it out in a few ways and it works for me.

To run it, say something like

       TOR_DEVTOOL_DIR=~/bin scripts/git/git-install-tools.sh all

To see what commands it wants to run, give it the -n flag.

To get help, give it the -h flag.

Trac:
Status: assigned to needs_review

(Note that right now there appear to be extra commits in the PR, because the github master is not up-to-date with the real tor master. Is torproject-pusher broken?)

Trac:
Reviewer: N/A to teor

I didn't run it, but it looks fine to me.

I opened #33603 (moved) to follow up the comment about bash "unofficial strict mode". (Shellcheck already gets us some of these things, but runtime checks are also helpful.)

Trac:
Status: needs_review to merge_ready