assistant: Add annotations to more languages (#15866)

Release Notes:

- N/A

crates/languages/src/c/outline.scm

@@ -68,3 +68,5 @@
                         ")" @context))))
     ]
 ) @item
+
+(comment) @annotation

crates/languages/src/cpp/outline.scm

@@ -147,3 +147,5 @@
                     ")" @context)))
     ]
     (type_qualifier)? @context) @item
+
+(comment) @annotation

crates/languages/src/go/outline.scm

@@ -1,3 +1,4 @@
+(comment) @annotation
 (type_declaration
     "type" @context
     (type_spec

crates/languages/src/javascript/outline.scm

@@ -71,3 +71,5 @@
         )
     )
 ) @item
+
+(comment) @annotation

crates/languages/src/python/outline.scm

@@ -1,3 +1,5 @@
+(decorator) @annotation
+
 (class_definition
     "class" @context
     name: (identifier) @name

crates/languages/src/tsx/outline.scm

@@ -74,3 +74,5 @@
         )
     )
 ) @item
+
+(comment) @annotation

crates/languages/src/typescript/outline.scm

@@ -74,3 +74,5 @@
         )
     )
 ) @item
+
+(comment) @annotation