ChainExtension
* Add `RegisteredChainExtension` * Add tests * Update frame/contracts/src/chain_extension.rs Co-authored-by: Michael Müller <michi@parity.io> * Add more docs * Remove debugging leftover * Make ChainExtension-registry lowercase * Apply suggestions from code review Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com> * Improve clarity of test inputs Co-authored-by: Michael Müller <michi@parity.io> Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>