[bisq-network/bisq] WIP Bitcoinj usage refactor example (#4269)

[dmos62]

Related project proposal: https://github.com/bisq-network/projects/issues/30

This example PR is meant to be read commit by commit.

It's a simple refactor of `WalletConfig` focusing on moving code. Moving code is the simplest (and least interesting) form of refactoring, but while doing it (similarly to shuffling puzzle pieces while solving a puzzle) you come up with more interesting refactorings, though it's a time-intensive process.

There are a few quirks here that are still to be ironed out:

- Naming of `low.PeerGroup` clashes with BitcoinJ's PeerGroup. Might come up with something better;
-  The whole `PeerGroup extends PeerGroupProxy` scheme has its upsides, but a few downsides too. Might come up with something better;
- `PeerGroupProxy` name clashes with `Socks5Proxy` and the like; naming isn't worked out in general;
- Part of the logic moved from `WalletConfig` to `low.PeerGroup` in this example might actually do better left in WalletConfig, which will require dissecting it further.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4269

-- Commit Summary --

  * Clone and substitute BitcoinJ's PeerGroup
  * Move some PeerGroup creation logic to btc.low
  * Reduce API access
  * Correction
  * Isolate more logic
  * Move to low.PeerGroup

-- File Changes --

    A core/src/main/java/bisq/core/btc/low/PeerGroup.java (98)
    A core/src/main/java/bisq/core/btc/low/PeerGroupProxy.java (111)
    M core/src/main/java/bisq/core/btc/setup/WalletConfig.java (46)
    M core/src/main/java/bisq/core/btc/setup/WalletsSetup.java (2)
    M core/src/main/java/bisq/core/btc/wallet/TxBroadcaster.java (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4269.patch
https://github.com/bisq-network/bisq/pull/4269.diff

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