[BUG] iroha_client 401 HTTP Response after executing get_config_value method

[Stukalov-A-M]

It happens because method doesn't pass Authorization header to the Request builder.
Also we are using both attohttpc and http crates for building HTTP requests, that creates code excessiveness and in some cases ambiguousness.
As an example - building a request through request body check.

pub fn build(self) -> Result<DefaultRequest> {
        self.inner
            .map(|b| DefaultRequest(b.bytes(self.body.map_or_else(Vec::new, |vec| vec))))
    }

For this reason, in the process of the bug fixing, I propose to refactor by removing the attohttpc crate from client and unify all HTTP request building using the http crate only.

[Stukalov-A-M]

Discussed with Daniil and Dmitriy that it's not safety to refactor request builder because current design provides a generic property for other request builders like ActixReqBuilder.
So, it was decided to add Authorization header only into "client/get_config()"

[nxsaken]

Fixed by #4180.