Display images in the summary view

[grzesiek2010]

Work towards #6084
Closes #7168

Why is this the best possible solution? Were any other approaches considered?

The new ImageWidgetAnswer component continues the approach we already introduced for video and file questions. Similar to those question types, I started refactoring the widgets so they can share the same answer component with the summary view.
To avoid making this PR too large, I started with the basic image question. I decided not only to rework it to use the new ImageWidgetAnswer, but also to shift from inheritance to composition by detaching it from its previous hierarchy. It previously extended BaseImageWidget, which had become a fairly convoluted structure.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

Images should be displayed in the summary view regardless of which image question type they come from (image/draw/signature/annotate). The summary view should be tested with all image question types, but we don’t need to test each image question type in form entry. Only the basic image question has been refactored, so that is the one that requires thorough testing. Only the basic image question currently shares the new image component with the summary view, so only that question type will display images with rounded corners. We plan to apply the same approach to the other image question types in the future.

Do we need any specific form for testing your changes? If so, please attach one.

The All question types forms should be enough.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• added or modified tests for any new or changed behavior
• run ./gradlew connectedAndroidTest (or ./gradlew testLab) and confirmed all checks still pass
• added a comment above any new strings describing it for translators
• added any new strings with date formatting to DateFormatsTest
• verified that any code or assets from external sources are properly credited in comments and/or in the about file.
• verified that any new UI elements use theme colors. UI Components Style guidelines