Fix circular dependencies

**What would you like to be added**:

Fix circular dependencies

**Why is this needed**:

In the project compilation phase, there is a warning about circular dependencies

```
(!) Circular dependency
src/lib/definitions/index.ts -> src/lib/definitions/specification.ts -> src/lib/definitions/workflow.ts -> src/lib/definitions/utils.ts -> src/lib/definitions/index.ts


```