Configurable default submission view format

I assume it's not uncommon to have complicated webform submissions that look far clearer/"cleaner" in Table view, rather than HTML; the former is more like reading two columns of a spreadsheet so it's easier to scan the fields. Also Table view lacks strips out display elements like header tags and horizontal rules.

It'd help to be able to set Table (or a format of your choice) as the default (probably on a per-form basis?), when:

a) clicking the 'View' tab in /admin/webform/manage/[form]/submission/[sid]
b) clicking submission table row in /admin/structure/webform/manage/[form]/results/submissions

For b), maybe even allow people to jump straight to 'Edit' when accessing a submission.

For the site I'm building, I've worked around this within a RouteSubscriber (not perfect as secondary tabs aren't correct):

if ($route = $collection->get('entity.webform_submission.canonical')) {
  // change view_mode from 'html'
  $route->setDefault( 'view_mode', 'table' );