When the DevTools server is started from an IDE, the IDE starts DTD and then passes the dtd uri to DevTools server. However, when the DevTools server is started from a CLI environment (i.e. if a user runs dart run or flutter run, then DevTools server will be spawned without a DTD uri being passed from an IDE.

In this case, we want to start DTD from DevTools server and manage the lifecycle.
CC @CoderDake @bkonyi