[Feature] Sequential migration execution for try-runtime (#12319)

* [Feature] Sequential migration execution for try-runtime

* remove unused

* guards

* reinstate encode/decode

* proper feature gate

* proper test feature gate

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* fix tests

* redo Tuple tests

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* use parameter_types for testing

* lint fix

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>

* Update frame/support/src/traits/hooks.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* eloquent feature gate

* redo tests

* more fixes

* properly handle pre/post errors

* remove some tests and fix the others

* add format import

* import fix

* more import fixes

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: parity-processbot <>