Add Monero Light Wallet Server Support

[CryptoGrampy]

trafficstars

It would be great to see Monero Light Wallet Server support added to Cake. For now, I would recommend adding this in as though it were a separate coin, so something like Monero (Light Wallet). Functionally, it should perform the same as a regular Monero wallet, though it would obviously sync much, much faster. Down the road, when subaddress support is added, it would be very cool to see a hybrid wallet that can fallback to standard scanning if perhaps a light wallet server goes down.

Potential Rust lib that could be used: https://github.com/walletd/walletd/blob/c2a987963ece8d08a7054a7df45da269d258f319/coins/monero/examples/transfer.rs

[CryptoGrampy]

This is somewhat of a duplicate of https://github.com/cake-tech/cake_wallet/issues/351 , but the description of that feature is inaccurate as standard Monero nodes support https.