feat: Add alias condition to code-block-lowlight

[dngwoodo]

Lowlight's lowlight.listLanguages does not support alias.

So, for example, if you use alias called js, it is not parsed properly.

Currently, a method called registered exists in the lowlight 2 version, but it does not exist in the 1 version, so this part is directly implemented.

Please check and merge.

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[bdbch]

We just upgraded lowlight in our demos to 2.7.0

Do you think this PR is still needed @dngwoodo

[dngwoodo]

The code const nodes = language &&'(language.includes(language) || registered(language)) is still needed. Even if you upgrade lowlight, alias is still not checked.

And I think there might be a user who uses a lowlight low version.

@bdbch