Integrate pkg for creating release executables

[sangaline]

This integrates Vercel's Pkg tool into the project for building single file executables of the CLI for distribution. There are arm and x86 builds for linux, macos, and windows now, the six builds are automatically uploaded as artifacts on every github release. I made a release off this branch to test this: https://github.com/Sindri-Labs/sindri-js/releases/tag/v0.0.1-alpha.44

Overall, I'm not that thrilled with Pkg, but it was the first tool I was able to get working reliably with the cross-platform builds and it seems like it's still the most popular choice for now. It's unmaintained, it has a number of bugs around filesystem access (e.g. fs.promises.access doesn't work), it doesn't support ESM, and it seems to break with dual ESM/CJS modules. Some alternatives we might want to try in the future:

• nexe - Seems like a pretty solid alternative, I'm guessing this is where most of the Pkg community moves now that it's unmaintained.
• node single executable applications - This is probably the best thing long-term, but it's still very experimental and the ergonomics are very rough.

[jason-sindri]

lgtm