General restructuring
=====================
* Restructures to workspace with script packages for each tool choice.
* Include build script to generate package for every supported tool
choice in library into the `.pesde/` directory.
* Remove testing .lune scripts for Rojo.
Manifest changes
================
* Exclude `.spec.luau` test files for library package.
* Include .pesde directory for library package.
* Add pathfs dev-dependency.
* Include metadata for build script package codegen.
* Use new git URL for index repo.
* Setup workspace including top level itself & tool choice script packages.
These changes require an unstable version of pesde: 2b2d280fe0.
