chore(ungrammar): fork ungrammar to get ready for adding new syntax

[faultyserver]

Summary

See #1407 for some more information. We want to add some new syntax to Ungrammar - the tool we use for defining the syntax tree and generating all of our node types -- to support some necessary features for CSS's flexible grammar (specifically, || and && combinators).

This PR just forks the current source of ungrammar into a new crate in this repository - biome_ungrammar - and updates the workspace to use it instead of the public one. Changes to ungrammar will happen in future PRs.

NOTE: Ungrammar has the MIT or Apache-2.0 License in it's Cargo.toml, but it doesn't actually include the license file. I've added a new LICENSE file to cover our fork, and mentioned that the original code was forked and was under a different license. I'm not perfectly sure if this is the appropriate way to do this, but it does retain original attribution according to the declared license from Ungrammar, and maintains our own licensing for future contributions as well.

Test Plan

All of the tests and code generation should still works exactly as they did before, since this only moves the crate into the repository with no changes.

[netlify]

✅ Deploy Preview for biomejs ready!

Name	Link
🔨 Latest commit	da7ab90
🔍 Latest deploy log	https://app.netlify.com/sites/biomejs/deploys/6596f19c06b69800082f8593
😎 Deploy Preview	https://deploy-preview-1418--biomejs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 98 (🔴 down 2 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 93 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[faultyserver]

Since Ungrammar doesn't actually have a LICENSE file, this is not truly known, but they are listed as the Author in the Cargo.toml where the license is declared, so I believe it to be as accurate as possible here.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	49701	49701	0
Passed	48721	48721	0
Failed	980	980	0
Panics	0	0	0
Coverage	98.03%	98.03%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6322	6322	0
Passed	2036	2036	0
Failed	4286	4286	0
Panics	0	0	0
Coverage	32.20%	32.20%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	662	662	0
Passed	592	592	0
Failed	70	70	0
Panics	0	0	0
Coverage	89.43%	89.43%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	17646	17646	0
Passed	13452	13452	0
Failed	4192	4192	0
Panics	2	2	0
Coverage	76.23%	76.23%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #1418 will improve performances by 9.48%

_{⚠️ No base runs were found}

_{Falling back to comparing faulty/fork-ungrammar (da7ab90) with main (b3a6ce1)}

Summary

⚡ 1 improvements
✅ 92 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	faulty/fork-ungrammar	Change
⚡	big5-added.json[cached]	2.5 ms	2.3 ms	+9.48%

[ematipico]

and mentioned that the original code was forked and was under a different license

This is enough, under the Apache 2.0 license terms

[ematipico]

Could you add an Apache 2.0 licence file too in this crate?

[faultyserver]

Added the license, and also updated the years to 2024 since the fork wasn't created until this year.