Publish as CommonJS module

[slosd]

I experienced both these issues, which occur because of the distribution as an
ES module:

#98 #96

I'm working on a node project with several dependencies on typescript projects
(including ioredis), none of which publishes as ES module. Migrating the project
to ES modules (in compiler options) comes with quite a few inconveniences and
leads to a degradation of the developer experience with VS code. In my opinion
it isn't a reasonable option for us at the moment, so I'd love to see this
changed.

[mike-marcacci]

Thanks so much for this contribution @slosd! I ended up taking the strategy proposed in #114 of publishing both CJS and ESM. While that approach has its own complexities, I felt that it best balanced my goals here. Thanks again!