Support detecting controllers that don't end with the _controller suffix in the filename

[marcoroth]

Most people follow the convention of having the controllers in a **/**/controllers/ folder and having the filename end with the _controller.{js,ts} suffix. Though there are still cases where people don't or cannot follow this convention.

In order to still support that we would need to look into all *.js or *.ts in a project and check if they somehow reference Stimulus controllers.