Update the config loading approach and introduce new binaries to support ESM configs. This addresses part of #572 and #686 as much as is possible without a potential breaking change.

Allow more extensions for config files

• .cjs and .mjs configs will "just work"
• .cts configs will work with ts-node 10 (which added .cts and .mts support)
• .mts is allowed, but will ONLY work if with the new just-esm/just-scripts-esm binaries (next section)
  • This restriction also applies to .ts configs in a module context (type: "module" in package.json)

Add new binaries to support TS ESM config files (+ tsx support)

Add two new binaries which spawn a new process to run the Just CLI via tsx or ts-node-esm (depending on what's installed in the repo):

• just-scripts-esm (just-scripts package)
• just-esm (just-task package)

You must use one of these binaries if you want to use a .ts or .mts config file in a module context (type: "module" in package.json).

They should also work in a CJS context, like if you just want to use tsx instead of ts-node. (It unfortunately doesn't appear to be possible to enable tsx or ts-node-esm with an after-the-fact register() call like with traditional ts-node.)

Load ESM configs with import()

Update the config loading logic to use import() for ESM configs. A config is considered ESM if one of the following is true:

• It has a .mjs or .mts extension
• The package.json has "type": "module" and the config has a .js or .ts extension (but see notes below)

This required updating the repo version of typescript to 4.7 so that I could use the module/moduleResolution "Node16" setting to prevent the import() from being transpiled to require().

Updates to ts-node setup

Also made some updates to the ts-node register() logic, for the previous TS loading approach

• Check the local typescript version and if it's >= 4.7, set ts-node's module/moduleResolution to "Node16" (to prevent dynamic import() from being transpiled to require())
• Skip ts-node register() if already running in ts-node or tsx (from the new binaries)