Enabling PowerApps MDA Image and Add Picture Control for Custom Pages with Test Engine Support

[v-nabalasubr]

Description

Enable PowerApps MDA Image and Add Picture controls for Custom Pages with Test Engine Support. This update involves creating a Power Apps MDA Custom page with all Image and Add Picture controls and developing a test plan to verify runtime and design time control properties. Additionally, code changes have been made to support asserting blank values for each control.

Work Items for this PR:
#423 - Image Control
#426 - Add Picture Control

Checklist

• The code change is covered by unit tests. I have added tests that prove my fix is effective or that my feature works
• I have performed end-to-end test locally.
• New and existing unit tests pass locally with my changes
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I used clear names for everything
• I have performed a self-review of my own code

[mcalderon00]

Is this correct? in line 24 we have:
typeMappings.Add("s", FormulaType.String);

With this new line, we have the mapping "i" as well returns string.

Why the string type is mapped twice? (is that needed?) I see Number was twice before.

This comment comes with very limited understanding on how this map is used.

[v-nabalasubr]

The newly added mapping for the Image data type in Model Driven apps enables the conversion of image URLs to strings within the PowerFx engine. This enhancement ensures that control values can be effectively retrieved and set through PowerFx-based test cases. Currently, the PowerFx engine does not support the Image/HyperLink data type, and only the string data type is available as an alternative for these types.