tests: Add dashd_sync.rs with test_wallet_sync

[xdustinface]

Add integration test infrastructure for SPV sync against a local dashd regtest node using a pre-generated blockchain (yet to be improved) which is stored in https://github.com/xdustinface/regtest-blockchain for now.

This currently adds just one basic wallet sync test which still fails at the moment on v0.41-dev. The PRs to fix it will follow soon:

test_wallet_sync

• Connecting the DashSpvClient to the dashd node
• Fully sync up to it with a wallet loaded that contains bunch of transactions
• Validate the wallet data (utxos, transactions, balance)

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch tests/dashd-sync

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