feat: add transformation ast to ir for simple and union query

src/errors.rs

src/frontend/sql.rs

src/frontend/sql/ast.rs

src/frontend/sql/ast/tests.rs

src/frontend/sql/grammar.pest

src/frontend/sql/ir.rs

src/frontend/sql/ir/tests.rs

src/ir/value.rs

tests/artifactory/frontend/sql/ir/complex_cond_query.yaml

...artifactory/frontend/sql/ir/complex_union_cond_query.yaml

tests/artifactory/frontend/sql/ir/simple_query.yaml

tests/artifactory/frontend/sql/ir/simple_union_query.yaml

tests/artifactory/frontend/sql/simple_query.yaml

tests/artifactory/frontend/sql/transform_select_2.yaml

tests/artifactory/frontend/sql/transform_select_3.yaml

tests/artifactory/frontend/sql/transform_select_4.yaml

tests/artifactory/frontend/sql/transform_select_5.yaml