chainreg: use feerate estimator in regtest and simnet

[starius]

Change Description

If feeurl is not provided and LND is running in bitcoind or btcd mode, use fee estimator provided by bitcoind or btcd instead of using static fee estimator (which always returns 50 sats/vbyte).

This enables simulating high feerate environment in regtest and simnet not only via feeurl, but also by filling mempool with high feerate transactions, which is closer to what happens in mainnet.

Also skip creating bitcoind or btcd fee estimator, if feeurl is provided. Before LND logged both "Initializing bitcoind backed fee estimator" and "Using external fee estimator" if running in bitcoind mode with feeurl provided, but actually feeurl was used, so this is not a change of behavior.

Steps to Test

• Setup regtest/simnet network with LND, e.g. in docker. Deploy LND from this branch.
• Run lncli wallet estimatefeerate 2 and make sure that sat_per_vbyte in response is 1. If you see value 50, this means that the deployed LND is not from this branch (previous behavior was to always return 50).
• Fill mempool with high feerate transactions, e.g. using mempool-filler tool
• Run lncli wallet estimatefeerate 2 again and make sure sat_per_vbyte is higher than 1.

I tested bitcoind/regtest and btcd/simnet modes.

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