Draft: adding operation precheck doc on shell and plugin
Context
This MR aims to provide documentation and some specification aspects for
the operation precheck
developed in !3813 (merged).
This MR includes and updates documentation on the protocol side:
- manager operations,
- operation application,
- manager operations precheck,
- plugins And on the shell part:
- prevalidator.
Contributes to #1964 (closed)
Edited by Germán Delbianco