Automatic execution planner

[caviri]

Context
Executions are trigger manually by the user. However, in some cases the executions is desired to be trigger at an specific rate. For instance, a energy digital twin that is updated every week.

Solution
Implement compatibility with Cron so the execution is generated and triggered on schedule.

Acceptance criteria

• Implementation of cron and odtp interface
• Cron configuration in CLI
• Cron configuration in GUI

Blockers
We need an execution template workflow that's going to be used to generate the execution entry in the cron job.