* feat(dev): Introduce "dev" helper
* feat(dev): Expose "dev" helper
* refactor: Use "named function" in some middleware.
* feat: `app.showRoutes()` is now deprecated. Use `showRoutes()` in `helper` instead.
* refactor: export RouterRoute interface for utility
* refactor: remove captureRouteStackTrace, add inspectRoutes
`captureRouteStackTrace` will be implemented after some more thought.
Instead, I added `inspectRoutes` to get routes as data.
* test: add tests for helper/dev/index.ts
* fix: run `format:fix`
* refactor: use named functions for middleware
* chore: denoify
* docs: tweaks deprecation warning message
* refactor(dev): Simplification of showList options
* chore: denoify
