[ref] blockchain-dal: redivision into 3 categories : read, write, entity

lib/modules/blockchain/blockchain-dal/Cargo.toml

lib/modules/blockchain/blockchain-dal/identity.rs

lib/modules/blockchain/blockchain-dal/src/constants.rs

lib/modules/blockchain/blockchain-dal/src/entities/block.rs

...blockchain/blockchain-dal/src/entities/currency_params.rs

...odules/blockchain/blockchain-dal/src/entities/identity.rs

lib/modules/blockchain/blockchain-dal/src/entities/mod.rs

...modules/blockchain/blockchain-dal/src/entities/sources.rs

lib/modules/blockchain/blockchain-dal/src/lib.rs

lib/modules/blockchain/blockchain-dal/src/readers/balance.rs

lib/modules/blockchain/blockchain-dal/src/readers/block.rs

lib/modules/blockchain/blockchain-dal/src/readers/certs.rs

.../blockchain/blockchain-dal/src/readers/currency_params.rs

...odules/blockchain/blockchain-dal/src/readers/fork_tree.rs

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

lib/modules/blockchain/blockchain-dal/src/readers/mod.rs

lib/modules/blockchain/blockchain-dal/src/tools.rs

lib/modules/blockchain/blockchain-dal/src/writers/block.rs

...es/blockchain/blockchain-dal/src/writers/certification.rs

...modules/blockchain/blockchain-dal/src/writers/dividend.rs