Add dollar value of BTC being send for a BTC transaction created by a dapp

[314159265359879]

Steps to reproduce

1. Go to unisat
2. Click inscribe
3. Pick any top level domain for example .ord
4. type a name (that is available)
5. click next
6. pick fee to send with and submit/pay invoice: pay with wallet
7. see

For PSBT users already are shown the dollar value like so:

And when sending BTC straight from the wallet we show this on the review modal: