feat(vscode): derive the Vue TextMate grammars with Monogram

Replace the hand-written Vue syntax grammars with ones derived by Monogram from a
single proven Vue/HTML grammar. The main SFC grammar and the two injections
(directives + interpolations) are now generated output.

The injections keep the same scopeNames (vue.directives / vue.interpolations),
selectors, and injectTo set, and remain thin stubs that include
text.html.vue#vue-directives / #vue-interpolations (the rule bodies live in the main
grammar's repository) — the same topology as before.

The <template> body now embeds text.html.derivative (the embedded-HTML-fragment scope
VS Code's HTML extension provides), which is what the interpolation injection targets.

Notable behaviour change: an `as` type assertion in a directive value
(#5012 / #6007 / #2096 / #520) no longer eats the closing quote — the derived grammar
bounds the value with a capture-embed, so `:msg="msg as string"` recovers correctly
after the cast instead of leaking TypeScript across the rest of the tag.

Grammar snapshot regenerated (extensions/vscode/tests/grammar.spec.ts).

Author: johnsoncodehk

extensions/vscode/syntaxes/vue.directives.tmLanguage.json

@@ -1,11 +1,10 @@
 {
 	"$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
-	"fileTypes": [],
-	"injectionSelector": "L:meta.tag -meta.attribute -meta.ng-binding -entity.name.tag.pug -attribute_value -source.tsx -source.js.jsx, L:meta.element -meta.attribute",
+	"scopeName": "vue.directives",
+	"injectionSelector": "L:meta.tag -meta.attribute -meta.ng-binding -entity.name.tag.pug -attribute_value -source.tsx -source.js.jsx -source.ts.embedded.html.vue, L:meta.element -meta.attribute -source.ts.embedded.html.vue",
 	"patterns": [
 		{
 			"include": "text.html.vue#vue-directives"
 		}
-	],
-	"scopeName": "vue.directives"
-}
+	]
+}

extensions/vscode/syntaxes/vue.interpolations.tmLanguage.json

@@ -1,11 +1,10 @@
 {
 	"$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
-	"fileTypes": [],
-	"injectionSelector": "L:text.pug -comment -string.comment, L:text.html.derivative -comment.block, L:text.html.markdown -comment.block",
+	"scopeName": "vue.interpolations",
+	"injectionSelector": "L:text.html.derivative -comment.block -source.ts.embedded.html.vue, L:text.html.markdown -comment.block -source.ts.embedded.html.vue, L:text.pug -comment -string.comment -source.ts.embedded.html.vue",
 	"patterns": [
 		{
 			"include": "text.html.vue#vue-interpolations"
 		}
-	],
-	"scopeName": "vue.interpolations"
-}
+	]
+}