feat: support ilike operator

doc/sql/query.ebnf

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

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

sbroad-core/src/frontend/sql.rs

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

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

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