feat: convert package to ESM-only

[wolfy1339]

BREAKING CHANGE: This package is now ESM only

[Copilot]

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test/index.test.js:5

• In ESM modules, local imports generally require explicit file extensions. Consider changing the import to "../index.js" to avoid potential resolution issues.

import { createLambdaFunction, Probot, ProbotOctokit } from "../index";

index.js:1

• For consistency with other local ESM imports (e.g., in lambda-function.js), including an explicit file extension ("./lambda-function.js") could help ensure proper module resolution.

import lambdaFunction from "./lambda-function";