(feat) implement generics attr on script tags

[dummdidumm]

sveltejs/rfcs#38 (comment)

[jasonlyu123]

Overall looks good. There are two minor issues I found. Do we need an equivalent throwIfIsGeneric for the generic attribute? You can define generic on the module script now, but it doesn't do anything. I also notice that semantic tokens sometimes highlight script lang="ts" generic as a function. The current check needs to be more. I think we can skip the highlight if the highlighted identifier is render and if the mapped source includes a script tag.

[dummdidumm]

I also notice that semantic tokens sometimes highlight script lang="ts" generic as a function.

Do you have a code snippet that reproduces this?

[jasonlyu123]

<script lang="ts" generics="T extends string">

</script>

It's more apparent in a dark theme