feat: modal disableAnimations and handleEscape props

[findhumane]

Motivation

Using a modal with a lot of content, the default Modal animations can sometimes be a bit flaky so I'd like an option to disable the animations. In addition, on web, I'd like an option for the Escape key to dismiss the Modal.

Related issue

Feature

Test plan

Added Modal examples in example app.

[callstack-bot]

Hey @findhumane, thank you for your pull request 🤗. The documentation from this branch can be viewed here.