feat(install): follow redirects for urls with no path

[kamilogorek]

This change makes absolute urls, that contain no path like deno install https://my-cli.io to follow redirects and extract the name from it.

It allows modifies test_util server listener on port 4550 (REDIRECT_ABSOLUTE_PORT) to allow for specifying redirect_to query param, that fill use that value for it's next redirect.

Note: it uses tokio::Runtime::block_on as HttpClient methods are all async, but I didn’t want to translate whole pipeline into async, due to the fact that the case I’m solving here is rather rare one.

Fixes #17409

[kamilogorek]

@dsherret I took some time and rewrote it using async/await. No need to create a new runtime anymore :)

[dsherret]

LGTM. Thanks for doing this!