add link to on send confirmation screen to block explorer tx url

[sirmattia]

[n13]

We will be able to do this once we fixed our tx hashes in subsquid.

For now the tx hashes in subsquid are not the same as we get back from the chain

The chain ones are correct, the subsquid / website / iOS app ones are incorrect - however, there's not really a big problem with this except for this one issue here.

Need to wait for this fix
https://github.com/Quantus-Network/quantus_subsquid/issues/10

[n13]

The other problem is even if we fix the hashes, the tx won't show up on the block explorer until 20 - 30 seconds later - up to 1 minute - so I am not sure if we should even try to do this.

A share button would probably be better, the share link would lead to the block explorer and maybe also have some other informaiton