Set issue labels based on conditions in issue form

[JakobDev]

This PR allows issue forms to set labels, based on what the user selects. Take for example this form:

name: Bug Report
about: File a bug report
body:
  - type: dropdown
    id: os
    attributes:
      label: Operating System
      description: What OS are you using?
      options:
        - Windows
        - macOS
        - Linux
      options_labels:
        Windows: ["OS/Windows"]
        macOS: ["OS/Mac"]
        Linux: ["OS/Linux"]
  - type: checkboxes
    id: lts
    attributes:
      label: LTS
      options:
        - label: This Bug also affects the LTS version
          labels: [LTS]

If Windows is selected, the issue gets the OS/Windows label, with macOS it gets the OS/Mac label and with Linux the OS/Linux label. When the checkbox is checked, the issue gets the LTS label. This can save some work.

This is missing.

• Validation
• Tests
• Documentation

I first want some feed back of this new feature before tackling any of this.

[delvh]

I can foresee problems when an option contains whitespace.
Is there any workaround for that, i.e. quoting the key?

[JakobDev]

I can foresee problems when an option contains whitespace.

YAML allows whitespaces in keys. Quoting of keys is also allowed, so there is no problem.