fix: watch list for imports depending on `options.paths`

This change is necessary since the file watcher is broken for those import paths that differ from the default import path. In other words, the current implementation of the file watcher doesn't consider additional import paths provided by the Options.path? interface member (though the loader does!).

This change implements an algorithm that checks for file existence at the default import path. If a file does not exist at the default import path, provided additional import paths are then considered. If one is found, the path is updated for the watcher's list by way of getLessImports. The fallback and default filepath used is always the default import path.

iam-medvedev / esbuild-plugin-less

fix: watch list for imports depending on `options.paths` #90