Make using insecure connections opt-in (#1309)

* add insecure url checks

* rename variables

* add feature flags to expose Url properly

* fix test compile error

* fix feature errors

* remove comment

* add url crate and use it for url parsing

* fix compile errors

* satisfy the holy clippy

* fix typos and host loopback

* macro attribute, provide validation function in utils

* fix expected output of ui tests

* remove the success case for --allow-insecure because we cannot establish ws:// connection at the moment.

codegen/src/fetch_metadata.rs

@@ -15,7 +15,6 @@ use jsonrpsee::{
 };
 use std::time::Duration;
 
-// Part of the public interface:
 pub use jsonrpsee::client_transport::ws::Url;
 
 /// The metadata version that is fetched from the node.