[iOS 14] Add the mailto URL mode as first choice for sending email

[matpag]

iOS 14 added the ability to change the predefined email app.

Instead of relying only on MFMailComposeViewController we can try to use the mailto alternative which will re-direct to the predefined email app configured by user.

On iOS 14+ if the attachments param is null (attachments are not supported by mailto protocol) we could try with mailto URL and if it fails fallback to MFMailComposeViewController.

More details here: https://stackoverflow.com/a/66379220/2910520