[feat] durs-blockchain : add blocks sub command

Cargo.lock

lib/core/core/src/commands/dbex.rs

lib/core/core/src/lib.rs

...modules/blockchain/blockchain-dal/src/readers/identity.rs

lib/modules/blockchain/blockchain/Cargo.toml

lib/modules/blockchain/blockchain/src/dbex.rs

lib/modules/blockchain/blockchain/src/lib.rs