feat(eslint): Rule "arrow-spacing"

Signed-off-by: Valentin Popov <info@valentineus.link>

ROADMAP.md

@@ -9,7 +9,7 @@
 - [ ] "array-element-newline"
 - [ ] "arrow-body-style"
 - [X] "arrow-parens"
-- [ ] "arrow-spacing"
+- [X] "arrow-spacing"
 - [ ] "block-scoped-var"
 - [ ] "block-spacing"
 - [X] "brace-style"

src/rules/eslint.json

@@ -3,6 +3,13 @@
     "error",
     "always"
   ],
+  "arrow-spacing": [
+    "error",
+    {
+      "after": true,
+      "before": true
+    }
+  ],
   "brace-style": [
     "error",
     "1tbs",