Adopt HTTPRequest and HTTPResponse type from swift-http-types

[grdsdev]

Request for Change

The swift-http-types package was added by @zunda-pixel in the #564 which refactored the internal HTTPHeaders type to use the HTTPFields from the package.

The swift-http-types also provides both HTTPRequest and HTTPResponse generic types.

Current behavior

We currently have both HTTPRequest and HTTPResponse types that we use internally for all requests/responses.

New behavior

Refactor internal HTTP layer to use types from swift-http-types package.

Open questions

swift-http-types doesn't standardize the body property, that is up to us to define how we're handling it.

I suggest the refactor of the HTTPClientType to be:

func send(for request: HTTPRequest, body: Data?) async throws -> (Data, HTTPResponse)

And forward to upload(from:body:) in case a non-nil body is provided, or data(for:), as:

func send(for request: HTTPRequest, body: Data?) async throws -> (Data, HTTPResponse) {
  let (data, response) = if let body {
    try await session.upload(for: request, body: body)
  } else {
    try await session.data(for: request)
  }

  let httpResponse = HTTPResponse(response as! HTTPURLResponse)
  return (data, httpResponse)
}

[zunda-pixel]

I think that adding body(Data, ByteBuffer or [UInt8]) to HTTPRequest is difficult problem on Server Side and Client Side.
And I think func send(for request: HTTPRequest, from body: Data?) async throws -> (Data, HTTPResponse) is good!

[zunda-pixel]

I created pr #568