"OR gate" for EnsureOrigin

[xlc]

Enable something like this

type AddOrigin = EnsureOneOf<
    EnsureProportionMoreThan<_1, _2, AccountId, CouncilCollective>,
    EnsureProportionMoreThan<_1, _1, AccountId, TechnicalCollective>,
    EnsureRoot<AccountId>,
>

This can also replace all those code

substrate/frame/membership/src/lib.rs

Lines 123 to 125 in 2e9697e

	T::AddOrigin::try_origin(origin)
	.map(|_| ())
	.or_else(ensure_root)?;

Relates to: paritytech/polkadot-sdk#369

[kianenigma]

Linked: paritytech/polkadot-sdk#369