Feat escalade options

[Lainow]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

Implement the following options in the Escalation tab of the plugin:

• Remove technicians during an escalation
• “Ticket” status after an escalation
• “Change” status after an escalation
• “Problem” status after an escalation
• Escalation event is private
• Assign me as an observer after an escalation by default

Screenshots (if appropriate):