This pull request makes sure that the build:test command is also run as part of the build and release step.

This way developers (especially plugin developers) can import all Stimulus' classes and types even if they are not publicly exported. We are not guaranteeing that those exports are non-breaking, but at least this will allow developers to make use of those classes even if we are not explicitly exporting them.

Importing classes would look something like:

import { Controller } from "@hotwired/stimulus"
import { TargetSet } from "@hotwired/stimulus/dist/core/target_set"
import { Context } from "@hotwired/stimulus/dist/core/context"

And types could be imported like:

import type { TargetSet } from "@hotwired/stimulus/dist/types/core/target_set"
import type { Context } from "@hotwired/stimulus/dist/types/core/context"

Resolves #623 and #638