Include triple-stash bracket for unescaped html and add brace to surroundingPairs (#68833)

Triple-stash {{{ ... }}} is used to surround an expression that should not be escaped for HTML
Having the option to enable surroundingPairs for brace would simplify the editing experience

extensions/handlebars/language-configuration.json

@@ -6,6 +6,7 @@
 		["<!--", "-->"],
 		["<", ">"],
 		["{{", "}}"],
+		["{{{", "}}}"],
 		["{", "}"],
 		["(", ")"]
 	],
@@ -19,6 +20,7 @@
 	"surroundingPairs": [
 		{ "open": "'", "close": "'" },
 		{ "open": "\"", "close": "\"" },
-		{ "open": "<", "close": ">" }
+		{ "open": "<", "close": ">" },
+		{ "open": "{", "close": "}" }
 	]
 }