* NodeJS has built-in testing tools now, so no need to include Mocha/Chai which bring in a lot of transitive dependencies.
* Removes ethers, as it was only being used for a few utility functions (which are now in `utils.js` and `keccak256`, whiche is better sourced from @noble/hashes.
* Adds @noble/hashes for `keccak256`.
* Removes hardhat, since it was brought in only to test one thing, and it is huge.
* Switches to esbuild for simple ESM targeted bundling with inlnined NodeJS dependencies.
* Pinned all JS dependencies to fixed versions.
* Adds a Dockerfile for generating reproducible builds.
* Commented out two tests that had a dependency on Hardhat.
