[style] bc-db: rename store CURRENT_METADATA

lib/modules-lib/bc-db-reader/src/constants.rs

lib/modules-lib/bc-db-reader/src/current_metadata.rs

lib/modules-lib/bc-db-reader/src/indexes/identities.rs

lib/modules-lib/bc-db-reader/src/lib.rs

lib/modules-lib/bc-db-reader/src/traits.rs

lib/modules/blockchain/bc-db-writer/src/blocks/fork_tree.rs

lib/modules/blockchain/bc-db-writer/src/current_metadata.rs

...modules/blockchain/bc-db-writer/src/indexes/identities.rs

...dules/blockchain/bc-db-writer/src/indexes/transactions.rs

lib/modules/blockchain/bc-db-writer/src/lib.rs

lib/modules/blockchain/bc-db-writer/src/writers/requests.rs

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

lib/modules/blockchain/blockchain/src/fork/fork_algo.rs

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

...les/blockchain/blockchain/src/sync/apply/blocks_worker.rs

...kchain/blockchain/src/sync/download/json_reader_worker.rs

lib/modules/blockchain/blockchain/src/sync/mod.rs

lib/tests-tools/bc-db-tests-tools/src/mocks.rs