Allow URL param on transaction pages to default to hex encoded memo shown

[grempe]

On a transaction page that has a memo field, for example,

https://stellar.expert/explorer/testnet/tx/2f6da192e5e3b0741695a588dbe4f41a46a5ec93ec2fb1d5aec6a86024553fc7

The memo is always shown as Base64 encoded, but there is an option to display it as Hex encoded.

For my use case it would be most helpful if I could link to the transaction, passing perhaps a URL query string param, that would default to showing the Hex encoded version, with the option to switch to Base64.

e.g. here it is with hexMemo query string param added.

https://stellar.expert/explorer/testnet/tx/2f6da192e5e3b0741695a588dbe4f41a46a5ec93ec2fb1d5aec6a86024553fc7?hexMemo=true

Thanks for considering.