splitting modules preparation

sbroad-cartridge/Cargo.toml

sbroad-cartridge/cartridge/roles/sbroad-router.lua

sbroad-cartridge/cartridge/roles/sbroad-storage.lua

sbroad-cartridge/src/api.rs

sbroad-cartridge/src/api/calculate_bucket_id.rs

sbroad-cartridge/src/api/exec_query.rs

sbroad-cartridge/src/api/helper.rs

sbroad-cartridge/src/api/invalidate_cached_schema.rs

sbroad-cartridge/src/cartridge.rs

sbroad-cartridge/src/cartridge/backend.rs

sbroad-cartridge/src/cartridge/config.rs

sbroad-cartridge/src/cartridge/config/tests.rs

sbroad-cartridge/src/cartridge/hash.rs

sbroad-cartridge/src/cartridge/hash/tests.rs

sbroad-cartridge/src/cartridge/router.rs

sbroad-cartridge/src/cartridge/storage.rs

sbroad-cartridge/src/lib.rs

sbroad-cartridge/src/router.lua

sbroad-cartridge/src/storage.lua

sbroad-cartridge/stress-test/README.md