Use ESM, drop build step

[sleepycat]

The API uses Babel and a build step to allow the use of the modern ECMAScript Module syntax. Full ESM support has recently been added to node, meaning Babel is no longer needed. This gives us the opportunity simplify the build, and drop a bunch of dependencies.

[h701h]

Luke approved on 2023-07-24 to keep open and in the back log.