Add Silent Payment send support

[guggero]

Depends on btcsuite/btcd#2244.

This PR adds SEND support for Silent Payment codes to the SendCoins RPC, and, due to the way it is implemented to make this work in a remote signing setup, also to the SignPsbt call.

Features:

• Add send support to lncli sendcoins, for example: lncli sendcoins --amt 5000 --addr tsp1....
• Generate Silent Payment output keys when PSBT_OUT_SP_V0_INFO is present in a PSBT's output
• Add ECDH shares and DLEQ proofs to PSBTs when using the walletrpc.SignPsbt RPC

TODOs:

• Logs of tests (unit, integration)
• Support multiple signers (e.g. adding ECDH shares and DLEQ proofs in multiple rounds, each signer verifying the other's shares/proofs)
• Documentation

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