[JavaScript][Validation] Customize parse warning messages for unsupported element/action types

[mokandre]

What platform is your feature request related to? (Delete other platforms).

• JavaScript

Is your feature request related to a problem? Please describe.

We would like to modify the warning message which displays in designer while trying to parse/render the unsupported element/action types of adaptive cards

Describe the solution you'd like

If users try to add unsupported element/action to their JSON then the warning message is showing up like [Parse] Unknown element type: Media. Fallback will be used if present. (Example for unsupported element)

We would like to have a way to customize parse warning messages for unsupported element/action types

Example for unsupported element [Parse] Unknown element type: Media

[ghost]

🎉AdaptiveCards@2020.07 has been released which fixes this issue.:tada:

Handy links:

• Release Notes
• AdaptiveCards Website
• Official NPM Designer Release
• Official NPM Templating Release
• Official NPM Renderer Release
• Official Nuget Templating Release
• Official Nuget Renderer Release
• Official Maven Renderer Release
• Official CocoaPod Renderer Release