build(deps): replace rocket with url crate for URI parsing in aw-transform (#484)

* Replace rocket to url for URI parsing

Url crate is most popular and basic for the task.
Rocket version in aw-transform is also out of sync with aw-server,
which may cause a conflict elsewhere.

* Easen dependency version

Reqwest specifies a particular version which may be a problem.

Author: 2e3s