Display the iOS share sheet. The options object should contain one or both of message and url and can additionally have a subject or excludedActivityTypes:
url (string) - a URL to share
message (string) - a message to share
subject (string) - a subject for the message
excludedActivityTypes (array) - the activities to exclude from the ActionSheet
NOTE: if url points to a local file, or is a base64-encoded uri, the file it points to will be loaded and shared directly. In this way, you can share images, videos, PDF files, etc.
The 'failureCallback' function takes one parameter, an error object. The only property defined on this object is an optional stack property of type string.
The 'successCallback' function takes two parameters:
a boolean value signifying success or failure
a string that, in the case of success, indicates the method of sharing