fix(language-support): support generic records

[its-miroma]

Notice line 14:

Before	After

[wenytang-ms]

LGTM, better to add a unit test case

[its-miroma]

Hello @wenytang-ms, I just got back to this!

I don't see any tests for the tmLanguage in the repo yet, do you know where I can find them?

[datho7561]

Looks good; improves the syntax highlighting for this case before the semantic tokens kick in. There's no need for unit tests; I don't think there's a good way to do that and we haven't been from what I understand.

Thanks, Miroma!

[its-miroma]

Thank you for merging!

I don't think there's a good way to do that

There are definitely ways to add tests for a tmLanguage, which might be interesting to explore:
https://github.com/PanAeon/vscode-tmgrammar-test

For example, by using the vscode-tmgrammar-snap command, one can create snapshots of the grammar scopes for certain snippets of Java source code, and track them in the repo.