registry admin script (#2426)

* registryadmin scripts

Add `start-sdk publish` command which can potentially replace
the Haskell implementation of `registry-publish upload`

* restructure modules

---------

Co-authored-by: Sam Sartor <me@samsartor.com>

backend/Cargo.toml

@@ -158,6 +158,8 @@ url = { version = "2.2.2", features = ["serde"] }
 urlencoding = "2.1.2"
 uuid = { version = "1.1.2", features = ["v4"] }
 zeroize = "1.5.7"
+indicatif = { version = "0.17.6", features = ["tokio"] }
+console = "^0.15"
 
 [profile.test]
 opt-level = 3