improve error handling in cli (#7436)
* other error variant should carry a dyn Error * introduce thiserror for error derive, add explicit error variants, cleanup dependencies * cleanup handle dev-deps of sc-cli too * Update client/cli/src/error.rs Co-authored-by: Bastian Köcher <[email protected]> Co-authored-by: Bernhard Schuster <[email protected]> Co-authored-by: Bastian Köcher <[email protected]>
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