fix(command-dev): replace deprecated static-server dep by fastify-static (#5341)

* fix(command-dev): replace deprecated static-server dep by fastify-static

* fix: callback for onRequest

* fix: stop generating etags, add status in error handler

* fix: send response body with status text for invalid methods

* fix: update test response, fix path resolution

* fix: resolve path correctly, make headers compatible

Author: tinfoil-knight