fix: cast VTable values to table types in dml

sbroad-cartridge/test_app/test/data/config.yml

sbroad-cartridge/test_app/test/integration/insert_test.lua

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

sbroad-core/src/frontend/sql/query.pest

sbroad-core/src/ir.rs

sbroad-core/src/ir/operator.rs