feat: add --lite option for git-node land (makes it usable with repos other than nodejs/node)

[DeeDeeG]

Makes it possible to use git-node land in repositories other than
nodejs/node. This is helpful for producing Node-style commit
footers, and enforcing some Node PR/commit conventions.

---

Context: Looking into whether git-node land can be used for landing stuff at the node-gyp repo. With this change, the answer would be "yes."

See: nodejs/node-gyp#2286

cc @rvagg thoughts? (I like that git-node land takes some of the work out of using Node-style commit message prefixes, and maintaining commit message footers such as Reviewed-By: and PR-URL:, but dropping all that and just using release-please and "conventional commit"-style commit messages would be even easier.)

Note to node-core-utils maintainers: If node-gyp maintainers aren't interested in this --lite flag feature, then I don't think there is a real-world user for it. In that case, with no real-world users, I wouldn't recommend merging this. Basically, I can only see this being useful if node-gyp maintainers want it (or someone pops up in the comments here to say they want it).

[rvagg]

yeah, could be a reasonable way to go, I still think moving away from this is probably the future for node-gyp, I tend to avoid pushing commits to nodejs/node these days because this process is getting more complex and onerous and the tooling probably only makes it more pleasant for frequent committers who have a good workflow and muscle memory for it.

I'll try and find some time to try this on node-gyp and report back.

[DeeDeeG]

Yeah, the more I use this, the more of a barrier I see it would be to contribution. I have shifted my attention mostly to understanding release-please, at least for node-gyp.

For the record:I tried this on my machine, and it worked for me. I didn't end up pushing the "landed" commit anywhere, but here is a screen recording of it:

Demo.of.running.git-node.land.--lite.mov

Note to node-core-utils maintainers: I still think this PR might be of interest if anyone wants to use git-node land elsewhere besides nodejs/node. There are a few other repos using the Node-style commit message prefixes and footers. But until someone actually wants to use git-node land with those repos, it seems reasonable not to merge this. If interest in this is renewed some time in the future, feel free to ping me about it. I will probably be able to respond to reviews/get this ready to merge if/when that happens.