* feat(grafana-ui): add an escape key listener to Modal

* Update packages/grafana-ui/src/components/Modal/Modal.tsx

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>

* feat(grafana-ui): add closeOnEscape prop to control Modal behaviour

Co-authored-by: Alex Khomenko <Clarity-89@users.noreply.github.com>