For #271167
This makes it so our built-in extensions can mostly be built using `tsc` on the command line. Previously the extensions were picking up a lot of typing info from the root `node_modules` that meant they weren't truly independent
* Contribute to html language server with a custom language.
Fixes#146730
Signed-off-by: azerr <azerr@redhat.com>
* refactor out LanguageParticipants
* restart client on language selector change
* htmlLanguage -> htmlLanguageParticipants
* tune autoInsert wording
* tune autoInsert description
Co-authored-by: azerr <azerr@redhat.com>
Co-authored-by: Martin Aeschlimann <martinae@microsoft.com>