swarm: bzz-list, bzz-raw and bzz-immutable schemes (#15667)

* swarm/api: url scheme bzz-list for getting list of files from manifest

Replace query parameter list=true for listing all files contained
in a swarm manifest with a new URL scheme bzz-list.

* swarm: replaace bzzr and bzzi schemes with bzz-raw and bzz-immutable

New URI Shemes are added and old ones are deprecated, but not removed.
Old Schemes bzzr and bzzi are functional for backward compatibility.

* swarm/api: completely remove bzzr and bzzi schemes

Remove old schemes in favour of bzz-raw and
bzz-immutable.

* swarm/api: revert "completely remove bzzr and bzzi schemes"

Keep bzzr and bzzi schemes for backward compatibility. At least
until 0.3 swarm release.

swarm/dev/scripts/random-uploads.sh

@@ -46,7 +46,7 @@ main() {
 }
 
 do_random_upload() {
-  curl -fsSL -X POST --data-binary "$(random_data)" "http://${addr}/bzzr:/"
+  curl -fsSL -X POST --data-binary "$(random_data)" "http://${addr}/bzz-raw:/"
 }
 
 random_data() {