Handle QueryErrors in client

[0x009922]

The Problem

If you go to api_spec.md#query, you may found the following table:

Responses:

Response	Status	Body *
Decode err.	400	QueryError::Decode(Box<iroha_version::error::Error>)
Version err.	400	QueryError::Version(UnsupportedVersionError)
Signature err.	401	QueryError::Signature(String)
Permission err.	403	QueryError::Permission(String)
Evaluate err.	400	QueryError::Evaluate(String)
Find err.	404	QueryError::Find(Box<FindError>)
Conversion err.	400	QueryError::Conversion(String)
Success	200	VersionedQueryResult

Currently, iroha_client does handle only 200 response, and just throws an untyped error in case when status code is not 200.

The Request

Handle 400-404 status codes too and return result with QueryError when it is possible:

enum RequestError {
  BadRequest(QueryError),
  Undefined(Whatever)
}

fn request(/* ... */) -> Result<R::Output, RequestError> {}

[s8sato]

The followings will be resolved together:

• [refactor]: Core, sumeragi, instance functions, torii #1965 (comment)
• [refactor]: Core, sumeragi, instance functions, torii #1965 (comment)
• [schema] #2108: Add pagination #2107 (comment)

Addressed in #2281