Read more option when the text message is too lengthy.

[toshanmugaraj]

Is your feature request related to a problem? Please describe.
Better user experience when scrolling through old messages.

Describe the solution you'd like
Fix a maximum optimal height for the text message by default, and provide a read more option button at the bottom of each text message when it exceeds the optimal height.

[toshanmugaraj]

[kittykat]

I'm going to move this to Element-meta discussions because it needs to be a cross-platform product decision