* Send Message WiP

* It compiles.

* Add tests.

* Use common macro.

* Nicer balance display.

* Get rid of redundant send_message_call function.

* Fix clippy.

Co-authored-by: Svyatoslav Nikolsky <[email protected]>

* Encode message.

* Update docs related to `sender`

Co-authored-by: Svyatoslav Nikolsky <[email protected]>
Co-authored-by: Hernando Castano <[email protected]>