Workflow templates for executions

[caviri]

Context
Right now the workflow is defined at the execution level. This means that every new execution should define a new workflow. This id non optimal when running several executions that differs in some one single parameter.

Proposed solution
Define new DB Collection called workflow templates. These workflows can be used by different digital twins and contains default values.

This means that one digital twin can have multiple executions templates that always have the same input/output semantic schema.

Acceptance criteria

• Create new workflowTemplates collection
• Develop document schema for workflowTemplates
• Implement logic on odtp
• Test small case for recurrent executions in digital twin.