Highlight the "namespace" of nested components as such

[alexlafroscia]

A Glimmer component name can have :: to denote a "namespace", where a component is inside of a directory

It might be nice to allow the namespace to be highlighted independently from the component name -- I'm sure there's a @namespace highlight or something, for languages like Ruby that use that frequently.

At the very least, the namespace should be part of the tag; : is not considered to be part of the tag right now.

<Directory::Component />
  {{! <- namespace }}

[alexlafroscia]

^ Ignore the reference in that commit; that was in error

[alexlafroscia]

I assumed that languages like Ruby, that use namespaced identifiers, highlight the namespace differently. It turns out that it doesn't seem like they do! Maybe we shouldn't, either... It might be enough to just highlight the :: separator itself as a single token.

[NullVoxPopuli]

I'm open to a PR that implements this, but the framework that provided this syntax, ember, is recommending everyone move to gjs/gts and off hbs, which no longer has the :: separator in component names