feat: support since annotations

grammar.js

@@ -45,6 +45,7 @@ module.exports = grammar({
       $.language_injection,
       $.see_reference,
       $.link_reference,
+      $.since_annotation,
     ),
 
     class_annotation: $ => seq(
@@ -165,6 +166,16 @@ module.exports = grammar({
       optional($.comment),
     ),
 
+    since_annotation: $ => seq(
+      '@since',
+      field('major', $.number),
+      '.',
+      field('minor', $.number),
+      '.',
+      field('patch', $.number),
+      optional($.comment),
+    ),
+
     qualifier: _ => choice('public', 'protected', 'private', 'package'),
 
     class_at_comment: $ => seq(

test/corpus/annotations.txt

@@ -306,3 +306,17 @@ is of type {@link CodeAction} or a Thenable that resolves to such.
     (comment)
     (identifier)
     (comment)))
+
+=========================
+Test a Since Annotation
+=========================
+
+@since 3.17.0
+
+---
+
+(documentation
+  (since_annotation
+    major: (number)
+    minor: (number)
+    patch: (number)))