chore(ui): Playground: make editor component resizeable

[m-rgba]

Issue:

Editor is currently setting a max-height when auto-expanding.
If we unlock max-height the editing view could be too long, pushing away the Cancel and Save controls.

Solution:

• Added a resizeable condition to the editor input component (disable if autogrow is enabled).
• Gave it a larger starting height.
• Disabled setIsShowingMore for max-height on edit so the user can expand the input.

Note:

Could we keep passing that generated height of the message content into the editor component?

• I think the perfect solution would be to un-cap the editor and have it auto-grow - we'd need some form of sticky action bar for the editor though to solve the issue addressed above.
• This PR will help fix the immediate usability issue though.

Before

After

[m-rgba]

Updated FeatureBee: https://beta.wandb.ai/?betaVersion=4bcca949107e3e1d31ef4cef5e68eebf075ee049