cc-logs-application-view: enhance fullscreen mode accessibility

[pdesoyres-cc]

When fullscreen is activated, it should be as if it was a modal:

• modal ARIA attributes should be set properly. see https://www.w3.org/WAI/ARIA/apg/patterns/dialog-modal/#wai-ariaroles,states,andproperties
• the focus should be trapped (it should be impossible to focus elements outside the modal). Below some implementation examples:
  • https://github.com/access42/AccessConfig/blob/master/js/src/accessconfig.js#L784
  • https://github.com/KittyGiraudel/a11y-dialog/blob/399372ee4d3cb1d3ec3dd4cbc93dc1ac0e8c04f3/src/dom-utils.ts#L190
• the Escape key should exit the fullscreen mode

[florian-sanders-cc]

@pdesoyres-cc sorry I forgot to specify this yesterday but it should be specified within the link I gave you: when closing the modal the focus should be moved back to the element that was used to trigger the modal (the fullscreen button). This is already done when using the exit fullscreen button but it should also be done when using the escape key :wink: