chore: add linting to action core javascript files (#1370)

Author: MikeMcC399

eslint.config.mjs

@@ -0,0 +1,16 @@
+import globals from 'globals'
+import pluginJs from '@eslint/js'
+
+export default [
+  pluginJs.configs.recommended,
+  { name: 'global-ignores', ignores: ['dist/', 'examples/'] },
+  {
+    name: `all-js`,
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      }
+    }
+  }
+]