feat: indent execution options in explain

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

...tridge/test_app/test/integration/left_outer_join_test.lua

sbroad-core/src/executor/tests/frontend.rs

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

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

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

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

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

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

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

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

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

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

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

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

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

sbroad-core/src/ir/distribution/tests.rs

sbroad-core/src/ir/explain.rs

sbroad-core/src/ir/explain/tests.rs

sbroad-core/src/ir/explain/tests/concat.rs