feat: code re-usage refactoring

sbroad-core/src/executor/ir.rs

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

sbroad-core/src/ir/api/parameter.rs

sbroad-core/src/ir/expression.rs

sbroad-core/src/ir/helpers.rs

sbroad-core/src/ir/operator.rs

sbroad-core/src/ir/transformation.rs

sbroad-core/src/ir/transformation/not_push_down.rs

sbroad-core/src/ir/transformation/redistribution/groupby.rs