feat: add TryFrom String reference for http provider

[mattsse]

Motivation

This is useful because

let url = format!("...");
let provider = Provider::try_from(&url);

does not work, we can also can't use TryFrom<T:AsRef<str>> because of some blanket conflicting impl in rust core that does not allow this.

Solution

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog