Sequential Supervisor (#186)

* move from tendermint-rs but needs discussion

* markdown lint

* TODO links replaced

* links

* links

* links lint

* Update rust-spec/lightclient/supervisor/supervisor.md

* Update rust-spec/lightclient/supervisor/supervisor.md

* Update rust-spec/lightclient/supervisor/supervisor.md

* Update rust-spec/lightclient/supervisor/supervisor.md

* moved peer handling definitions to supervisor

* polishing

* rename

* Update rust-spec/lightclient/supervisor/supervisor_001_draft.md

* Update rust-spec/lightclient/supervisor/supervisor_001_draft.md

* changes to maintain StateVerified again

* ready for changes in verification

* start of supervisor

* module name

* fixed

* more details

* supevisor completed. Now I have to add function to verification

* ready for review

* tla comment

* removed issues

* Update rust-spec/lightclient/supervisor/supervisor_001_draft.md

* intro text fixed

* indentation

* Update rust-spec/lightclient/supervisor/supervisor_001_draft.md

* comment to entry points

Co-authored-by: Marko Baricevic <marbar3778@yahoo.com>