Add type for call types:

1. body_disallowed_call : HTTP client call where body is not allowed to be
present in the request

2. body_allowed_call : HTTP client call where body is allowed to be present
in the call.

Add functions call, get,head,delete,post,put and patch functions to imitate
HTTP method calls.

Adde tests/demos both writing and reading chunked encoding in both client and
and server.

RFC https://www.rfc-editor.org/rfc/rfc7230#section-3.3.3 point 7 states
that responses with missing Content-Length/Transfer-Encoding headers
should read the message body until the end of file.

This commit implements the above spec. Since now that read_fixed is
different in client and server, we also remove it from the Body module.

…mters