feat: resource loader service

[crookse]

Summary

What:

Make a service that loads all resources in given directories.

Why:

Manually typing in the import statement and writing the resource class names in the resources config can be cumbersome.

Acceptance Criteria

Below is a list of tasks that must be completed before this issue can be closed.

• Write documentation
• Write unit tests
• Write integration tests

Example Pseudo Code (for implementation)

import { ResourceLoaderService } from "...";

const server = new Drash.Server({
  // ResourceLoaderService yields a single array of resources from multiple paths and excludes whatever is in `exclude`
  resources: new ResourceLoaderService({ 
    paths: [ "./src/v1/resources", "./src/v2/resources" ],
    exclude: [ HomeResource, SecretResource, SomeResource ]
  })
});