pkg: esm migration

[matildepark]

Let's hold this and really test it.

• Pulls out gluegun, rewrites all task runners with yargs
  • Migrates to the latest inquirer as a part of this
• Possibly fixes a server leak (not sure if it's on prod, but it was in the working branch here that ctrl+c would exit the process but leave the server running...)
• Changes ESLint and TSConfig for ESM + file extensions
• Adds file extensions to every single relative import
• Changes two occasions (in my code, rip) where we were using commonjs-specific behaviour or checks to work with ESM context

~npm run serve runs~ it runs until you try to open a new page. ~nolita task runner functions normally~ unless it needs to go to a new page. Need to try other critical paths.

Would definitely necessitate a breaking change bump to 3.0 since CJS would then be deprecated. Need to try importing the package in create and in a non-create package, probably.

[matildepark]

Right, I think jest needs a specific flag.

edit: Apparently our jest doesn't use the same TSConfig as the rest of the codebase? It chokes up at a module resolution that we're already set and compile with. I wonder if it makes more sense to be compiling and testing the compiled code vs. testing the source? Not sure.

[matildepark]

Hmm, I think navigation is broken on this branch. But if you go right to a page it works. Need to try re-resolving types in the imports I think, instead of referencing .js files without them.