[wip] lnwallet+walletrpc: add SubmitPackage and related RPC call

[bhandras]

depends on:

• chain: add SubmitPackage API for atomic parents+child relay btcsuite/btcwallet#1009
• btcjson: add stubs for SubmitPackage btcsuite/btcd#2366

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[sputn1ck]

Maybe a small comment why V3 is used here. Something something only V3 transactions allow 0 fee

[sputn1ck]

I think it would be interesting if we specifically set the feerate so that we pay X feerate for the whole transaction, as right now this estimator is used only for the child and thus the expected feerate is inaccurate for the package