[FLCRM-10300] Add ButtonField as a possible target for the click event

[juanmiret-sn]

Add ButtonField as a possible target for the click event.

They need it in mobile for the new task UX flows.

https://fulcrumapp.atlassian.net/browse/FLCRM-10300

Tested that HyperLink field still works on web by adding this on data events and making sure it shows the alert:

ON("click", 'hyperlink_test', function(event) {
  ALERT("Hyperlink clicked");
});

[juanmiret-sn]

Tested that HyperLink field still works on web by adding this on data events and making sure it shows the alert:

ON("click", 'hyperlink_test', function(event) {
  ALERT("Hyperlink clicked");
});

@osbornk