[web] Added ChatInputTextArea component

Summary: This components handles resizing of textarea, when amount of lines in text changes. It also provides Escape and Enter operations. It will be used later for the editing GUI.

Test Plan: Used component, checked if the height is adjusted correctly, checked if key operations work.

Reviewers: michal, inka

Reviewed By: michal

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7822