Metrics exposition from steps

[caviri]

Context
In order to visualize and compare the evolution of some executions the users is required to wait until the process is done. In this case there's still the need of a custom component to consult and compare different executions. It would be more useful if the GUI could offer this.

Proposed solution
Inspired by Weight and Biases (https://wandb.ai/site) the odtp component can store in the step document some selected metrics. These metrics should be expose by the component developer.

Acceptance criteria

• Define a simple use case for this feature
• Develop the logic in odtp-component-client to store these metrics in the database
• Update step schema to store metrics
• Implement feature in odtp orchestrator
• Develop compatibility with ODTP GUI