[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 <[email protected]>

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

Co-authored-by: Kian Paimani <[email protected]>

* fix tests

* redo Tuple tests

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

Co-authored-by: Kian Paimani <[email protected]>

* use parameter_types for testing

* lint fix

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

Co-authored-by: Jegor Sidorenko <[email protected]>

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

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* 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 <[email protected]>
Co-authored-by: Jegor Sidorenko <[email protected]>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: parity-processbot <>