feat: bump dependencies and add some improvements

Author: to-kn

.changeset/poor-suns-hammer.md

@@ -0,0 +1,9 @@
+---
+'@as-integrations/koa': major
+---
+
+Upgrade to koa v3, @koa/bodyparser and node 22
+Since koa v3 only supports node >= 22, we do it too.
+Making it compatible with koa-bodyparser and @koa/bodyparser (which is the more up-to-date version)
+
+Adding the call to next() as in https://github.com/apollo-server-integrations/apollo-server-integration-koa/pull/232

.eslintrc.cjs

@@ -0,0 +1,21 @@
+const tsPlugin = require('@typescript-eslint/eslint-plugin');
+const tsParser = require('@typescript-eslint/parser');
+
+module.exports = [
+  {
+    files: ['src/**/*.ts'],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        project: 'tsconfig.eslint.json',
+        tsconfigRootDir: __dirname,
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+    },
+    rules: {
+      '@typescript-eslint/consistent-type-imports': 'error',
+    },
+  },
+];