Support perforce as an origin and destination

[dijit]

There's a lot of warts with this currently, this is the patch we're using at Red Notice to sync our git/gerrit repos with our game depots in perforce.

Therefore it's built for specifically our needs;

Still missing to be production ready:

[x] P4TOKEN support
[ ] Dry-Run mode (we don't use it, so we didn't wire it)
[ ] Symlinks and special characters
[ ] SSL Support (incl. hash pinning)
[ ] UTF-8 Support (incl. translation)

If you want me to keep working on this patch I will, it'd be better to have the work upstreamed for me instead of constantly rebasing.

I had to make some minor edits to MODULE.bazel to include p4java (instead of shelling out to a p4 binary)
I also changed the copyrights from our Red Notice ones to be Google ones.

Let me know if I should proceed with the finishing touches or not. We're happy to continue with the patch as-is of course.

[dijit]

I'm going to guess that import/copybara fails because of the new include

MODULE.bazel -> com.perforce:p4java:2026.1.2989454
third_party/BUILD -> //third_party:p4java

Sorry, it's not an error I can clear.