Proposal: Defensive trait for infallible frame operations (#10626)

* add a blueprint of how defensive traits could look like

* add something for arithmetic as well

* add some use cases in different pallets

* some build fixing

* Some new stuff and examples

* Fix deadly bug

* add more doc.

* undo faulty change to assets pallet

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

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

* some review comments

* remove draft comment

* Fix ident test

* Fix proxy tests as well

* a few new ideas

* Fix build

* Fix doc

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