Checkbox for Boolean inputs when triggering `workflow_dispatch`

**Is your feature request related to a problem? Please describe.**
When triggering a workflow via the view in vscode, the extension asks for input values. Currently, it generates an error when giving a string that is not `true` or `false` for boolean inputs.

**Describe the solution you'd like**
Use a checkbox input instead of a string input when asking vscode user for input.

**Additional context**
Add any other context or screenshots about the feature request here.