RPC: getblockchaininfo: BIP9 stats

add RPC tests for BIP9 counting stats

src/validation.cpp

@@ -4153,6 +4153,12 @@ ThresholdState VersionBitsTipState(const Consensus::Params& params, Consensus::D
     return VersionBitsState(chainActive.Tip(), params, pos, versionbitscache);
 }
 
+BIP9Stats VersionBitsTipStatistics(const Consensus::Params& params, Consensus::DeploymentPos pos)
+{
+    LOCK(cs_main);
+    return VersionBitsStatistics(chainActive.Tip(), params, pos);
+}
+
 int VersionBitsTipStateSinceHeight(const Consensus::Params& params, Consensus::DeploymentPos pos)
 {
     LOCK(cs_main);