Prioritize issue types

[hielfx]

Motivation

Currently we don't have a to prioritize GH Sherpa issue types.

In case an issue has several labels associated to several issue types, there should be a way to prioritize one issue type over the others.

One way to achieve this could be creating a new configuration (or inside the current branches one) so we can provide a way to configure this priority, using (for example) a list:

...
branches:
  issue_types_priority: ["bugfix", "feature", "refactoring", "documentation", ...]

Acceptance criteria

• [ ] A check list of tasks to be done to assume the issue addressed