Add parsing to template when open in workspace #111
Description
When a template document is opened, we should parse the template using the internal parser. At least to start, I think using the debug config option detailed in #66 should enable inlay hints showing the template nodes parsed.
After that, some actual diagnostics around tags (missing end tags, e.g.) and perhaps adjusting the completions if in the middle of a tag that has intermediates would be the next steps. You know, once we get the bare minimum working.