Adds Video and Image diemensions field in respective class

[himanshu-patel-dev]

Both classes ImageConversationCard and VideoConversationCard have field which have data related to dimensions/size of Video/Image but these fields despite present in API are being dropped/ignored in class properties/attributes, thus consumer of this library can't assess data like 'image_display_height' on ImageConversationCard till now. Current fix enable the same for both Image and Video Conversation Card.

Issue Type: Improvement

Fixes / Relates To: #273

Changes Included:

• Adding two properties image_display_height and image_display_width in ImageConversationCard class
• Adding two properties video_width and video_height in VideoConversationCard class

[CLAassistant]

All committers have signed the CLA.

[himanshu-patel-dev]

Can maintainers of the librarary provide approval for remaining workflows to trigger. @tushdante