feat: add multiple subarenas

sbroad-benches/benches/parse.rs

sbroad-cartridge/src/cartridge/router.rs

sbroad-cartridge/src/cartridge/storage.rs

...d-cartridge/test_app/test/integration/arithmetic_test.lua

sbroad-core/src/backend/sql/ir.rs

sbroad-core/src/backend/sql/ir/tests/except.rs

sbroad-core/src/backend/sql/ir/tests/selection.rs

sbroad-core/src/backend/sql/space.rs

sbroad-core/src/backend/sql/tree.rs

sbroad-core/src/cbo/histogram.rs

sbroad-core/src/errors.rs

sbroad-core/src/executor.rs

sbroad-core/src/executor/bucket.rs

sbroad-core/src/executor/engine.rs

sbroad-core/src/executor/engine/helpers.rs

sbroad-core/src/executor/engine/helpers/storage.rs

sbroad-core/src/executor/engine/helpers/vshard.rs

sbroad-core/src/executor/engine/mock.rs

sbroad-core/src/executor/ir.rs

sbroad-core/src/executor/protocol.rs