test: Add functional test for bitcoin-chainstate

Adds basic coverage for successfully validating a mainnet block as well
as some duplicate and invalid data.

test/functional/test_runner.py

@@ -193,6 +193,7 @@ BASE_SCRIPTS = [
     'feature_bind_extra.py',
     'mempool_resurrect.py',
     'wallet_txn_doublespend.py --mineblock',
+    'tool_bitcoin_chainstate.py',
     'tool_wallet.py --legacy-wallet',
     'tool_wallet.py --legacy-wallet --bdbro',
     'tool_wallet.py --legacy-wallet --bdbro --swap-bdb-endian',