[DWDS] provide an API to map the package: paths to server paths to match the directory structure

[annagrin]

parent: #1692

Proposed fix

make server paths follow directory structure:packages/<package_directory>/<path from package root to the file on disk>

Fix plan

• Dwds:
  • provide a way to map package: uris to server paths, ie a new class PackageUriMapper
  • pass the debugger-module-uris to the expression compiler worker