* Upgrade substrate to alpha 5.

* Upgrade serde & codec.

* auction, oracle and prices brief documentation

* add gradually-update and schedule-update brief doc

Co-authored-by: Ermal Kaleci <ermalkaleci@gmail.com>

* update to pre-release version

* update nightly version

* fix build issue

* add schedule-update

* schedule-update add convert_vec_to_u8

* fix ci build

* remove sp_state_machine

* change OnReapAccount to OnKilledAccount