Extend SS58 network identifiers (#8039)

* Initial draft

* Fixes

* Fixes

* Fixes

* Fixes

* Fixes

* Improve readability, add format filter.

* Link

* Fixes

* Update primitives/core/src/crypto.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Suggestions from review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>