Kaspad v0.9.0

• Merge big subdags in pick virtual parents (#1574)
• Write in the reject message the tx rejection reason (#1573)
• Add nil checks for protowire (#1570)
• Increase getBlocks limit to 1000 (#1572)
• Return RPC error if getBlock's lowHash doesn't exist (#1569)
• Add default dns-seeder to testnet (#1568)
• Fix utxoindex deserialization (#1566)
• Add pruning point hash to GetBlockDagInfo response (#1565)
• Use EmitUnpopulated so that kaspactl prints all fields, even the default ones (#1561)
• Stop logging an error whenever an RPC/P2P connection is canceled (#1562)
• Cleanup the logger and make it asynchronous (#1524)
• Close all iterators (#1542)
• Add childrenHashes to GetBlock/s RPC commands (#1560)
• Add ScriptPublicKey.Version to RPC (#1559)
• Fix the target block rate to create less bursty mining (#1554)