Make compose textarea automatically grow when you have entered a lot of text

[shawnborton]

Problem:
Textareas don't automatically grow when you have more text than the available amount of lines.

Solution:
Much like Slack does, when you have a lot of text entered into a text area, let's make the textarea grow in size. We should be able to do this via JS?

[quinthar]

Ooh neat. I don't think people would puke on the prototype without this, but I think it's good, so I'm calling MEDIUM.

[shawnborton]

More reading: https://github.com/rusfearuth/react-native-auto-grow-textinput

[Jag96]

I've got a local branch for this, the approach is the same as we do for web now: https://github.com/Expensify/Web-Expensify/blob/b2a0a2cc5414e11167211f44c598ca156b272b55/js/components/AutoResizeTextArea.jsx#L35-L34.

[mallenexpensify]

I'd love to bump this up from Low, in the desktop app you currently can't type more than two lines without text disappearing. It's 'forced' me to compose messages in gdoc then copy paste over, which isn't ideal.

[JmillsExpensify]

This is really hurting me daily. Increasing the importance, especially with DMs coming.