Export grammar-related generators from CLI

[Lotes]

For the Langium playground I need to import the Textmate generator.
Therefore I am exporting a couple of generators from the CLI.
My current alternative is to copy the code from this repo, which is actually not that nice.

Speak up if you want a different export strategy. Currently I am exporting each generator in its own export alias.

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This PR adds a new ESM export /textmate to the langium-cli package. It contains the highlighting generator for Textmate syntax highlighters (Monaco editor).

[dhuebner]

@Lotes
In general I think it is good to export useful components to users. One thing to keep in mind, when exporting code we make it a public API, hence need to care that we do not break it in the future and we should document it.
If you just need the textmate generator, maybe we should first only export just this generator, WDYT?

[Lotes]

@dhuebner Thanks for the argument. That is a very valid point. Then I will only export the Textmate generator. But even there I am unsure: Shall I export it under "/textmate" or better under something more general like "/syntax-highlighting"...? Maybe start with something specific and deprecate when the time has come and it becomes more general?

[montymxb]

I agree with @dhuebner here. Exporting just what we need makes sense for now. And as for the name, textmate seems fine, but we should document that new endpoint to make it clear what it provide (later on, before the next release).

[msujew]

Since the textmate-generator.js file imports from ../util.js, it also attempts to import node libraries such as node:path and node:url. We should split the node related utilities from the Langium related utilities, as the node imports make the ./textmate import difficult to bundle in a browser environment. It would require a lot of shims/polyfills in order to successfully bundle/run.

[Lotes]

@montymxb As far as I can see there is no next change log file or something similar. So I will document the endpoint in the main description of this PR.
@msujew I have done the split. Nice catch. Please have another look.

[montymxb]

Looks okay from my end. Documentation is just a note, we'll handle that later of course 🙂 .

[Lotes]

I need to wait for #1437 since I want to increment the Langium CLI version and trigger Langium generator for the examples.

[msujew]

Looks pretty good. Just two minor suggestions, see below.

[msujew]

Great, looks good to me 👍