[fix] #79 comply clippy warnings

blockchain/clippy.toml

blockchain/lib.rs

blockchain/stack_up_block.rs

blockchain/sync.rs

core/lib.rs

dal/block.rs

dal/clippy.toml

dal/dal_requests.rs

dal/identity.rs

dal/lib.rs

dal/parsers/blocks.rs

dal/parsers/certifications.rs

dal/parsers/revoked.rs

dal/writers/block.rs

dal/writers/certification.rs

dal/writers/requests.rs

message/lib.rs

tui/lib.rs

ws2p/lib.rs

ws2p/ws2p_connection.rs