swap ed25519-dalek for ed25519-zebra (#11781)

* swap ed25519-dalek for ed25519-zebra; no batch verificaiton

fixed batch verificaiton tests

removed additional zero verificaiton tests

removed comments, fixed test bug, added #[derive(Clone)]

Update primitives/core/src/ed25519.rs

Co-authored-by: Squirrel <[email protected]>

* modified assertion to allow default ed25519-zebra zero key behavior

* cargo clippy

* Update primitives/core/Cargo.toml

Co-authored-by: Bastian Köcher <[email protected]>

* Update primitives/core/src/ed25519.rs

Co-authored-by: Davide Galassi <[email protected]>

* Update primitives/core/src/ed25519.rs

Co-authored-by: Davide Galassi <[email protected]>

* Update primitives/core/src/ed25519.rs

Co-authored-by: Davide Galassi <[email protected]>

* Update primitives/core/src/ed25519.rs

Co-authored-by: Davide Galassi <[email protected]>

* updated Cargo.lock for sp-core

* fix inaccurate comment

Co-authored-by: Squirrel <[email protected]>
Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Davide Galassi <[email protected]>