feat(import): Rule "first"

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

ROADMAP.md

@@ -288,7 +288,7 @@
 - [ ] "export"
 - [X] "exports-last"
 - [ ] "extensions"
-- [ ] "first"
+- [X] "first"
 - [ ] "group-exports"
 - [ ] "imports-first"
 - [ ] "max-dependencies"

src/rules/import.json

@@ -1,5 +1,8 @@
 {
   "import/exports-last": [
     "error"
+  ],
+  "import/first": [
+    "error"
   ]
 }