Option to create branch/merge request for issue automatically
### Problem to solve
As a Dev Manager, I want to create a feature branch/merge request per issue while creating an issue without navigating to the issue page and clicking the button.
### Intended users
This feature can be used by everyone who is responsible for creating issue and set up feature branches etc.
### User experience goal
The ux goal for the single user is saving two steps in the workflow of creating an issue with corresponding feature branch/merge request, i.e. navigating to the issue page and selecting/clicking the button for feature branch/merge request creation.
### Proposal
Set up an option in 'Settings' -> 'General' -> 'Default issue template' to enable feature branch creating with a template (preferred) or providing an option for feature branch/merge request creation on the issue creation page. (API integration would be the sh**!)
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