feat!: switch to ESM, fix output colourising, dedupe more code w/ branch-diff

[rvagg]

• upgrade all deps, including ESM-only deps
• --simple is now default output, including colourising, with --markdown being an opt-in output format (that doesn't colourise).
• move process + print logic to separate module for exporting for simplifying branch-diff
• add --sha and --reverse options from branch-diff to dedupe some processing code (will open an PR over there that pulls this in)

The biggest change is that second item, the default output is nice for the terminal but if you want it for changelogs then you'll need to --md to get it and you won't have colourisation for that. The new markdown formatter and ansi don't mix. So this change will require some @nodejs/releasers input.

Change set is probably a bit for a full review, but if you're interested then maybe clone it and npm link it to try it out.

Fixes: #120
Closes: #107
Closes: #119

[Trott]

LGTM but I'm not a releaser so I'm not sure if/how this impacts their process....

[richardlau]

The biggest change is that second item, the default output is nice for the terminal but if you want it for changelogs then you'll need to --md to get it

I think switching the default would mean we'd have to update https://github.com/nodejs/node-core-utils/blob/e7a95a4ec4b166b9311c673f1d4617da4a13d2bc/lib/prepare_release.js#L291-L303 when we update https://github.com/nodejs/node-core-utils/blob/d1c52e669439dbe22bc902cfa5d767328b91b06b/package.json#L36. I haven't really used that aspect of node-core-utils much (normally I run changelog-maker and copy/paste into the changelog being updated).

Change set is probably a bit for a full review, but if you're interested then maybe clone it and npm link it to try it out.

Lazy way to try it out

npx nodejs/changelog-maker#rvagg/esm-upgr ...

[rvagg]

Whoa this didn't get merged, I forgot all about it.

@nodejs/releasers heads-up this is going out as a 3.0.0 and you'll need a --md to generate changelogs now, but I'm sure you'll notice it coming out wrong if you don't update your workflow - unlikely to slip into a release because of the markdown linter in nodejs/node.

[github-actions]

🎉 This PR is included in version 3.0.0 🎉

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