feat(route): add github issues/pull comments (#8128)

lib/v2/github/radar.js

@@ -0,0 +1,13 @@
+module.exports = {
+    'github.com': {
+        _name: 'GitHub',
+        '.': [
+            {
+                title: 'Issues / Pull Requests 评论',
+                docs: 'https://docs.rsshub.app/programming.html#github',
+                source: ['/:user/:repo/:type/:number'],
+                target: '/github/comments/:user/:repo/:type/:number',
+            },
+        ],
+    },
+};