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.

examples/wasm-example/src/services.rs

@@ -1,5 +1,4 @@
 use anyhow::anyhow;
-use futures::StreamExt;
 use js_sys::Promise;
 use serde::{Deserialize, Serialize};
 use serde_json::json;