change(mining): Restores parts of the internal-miner feature for use on Regtest

[arya2]

Motivation

We want Zebra to have an internal miner for use on Testnet and Regtest.

Part of #8183.

Depends-On: #8505.

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Solution

Restores parts of the internal-miner feature and uses a empty Solution instead of the equihash tromp solver.

Testing

Manually tested.

Review

Anyone can review.

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[mpguerra]

@arya2 will this close #8183 ?

[arya2]

@arya2 will this close #8183 ?

Not yet. This doesn't mine valid equihash solutions, so it won't work on the default testnet, and it's single-threaded since multiple threads are unnecessary while it skips checking the proof of work.

[oxarbitrage]

@Mergifyio refresh

[mergify]

refresh

✅ Pull request refreshed