feat: new -llmqmnhf param for devnet (#5634)

## Issue being fixed or feature implemented
By default consensus for devnet if 50_60 that is way too much:
```
        consensus.llmqTypeMnhf = Consensus::LLMQType::LLMQ_50_60;
```
So, `quorum list` on devnet-ouzo is empty:
```
{
  "llmq_50_60": [
  ],
```

## What was done?
Adds new -llmqmnhf param for devnet to change quorum params dynamically.

## How Has This Been Tested?
<not tested>

## Breaking Changes
n/a

## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone

src/chainparams.cpp

@@ -659,6 +659,7 @@ class CDevNetParams : public CChainParams {
         UpdateDevnetLLMQInstantSendFromArgs(args);
         UpdateDevnetLLMQInstantSendDIP0024FromArgs(args);
         UpdateDevnetLLMQPlatformFromArgs(args);
+        UpdateDevnetLLMQMnhfFromArgs(args);
         UpdateLLMQDevnetParametersFromArgs(args);
         UpdateDevnetPowTargetSpacingFromArgs(args);
 
@@ -737,6 +738,14 @@ class CDevNetParams : public CChainParams {
         consensus.llmqTypeAssetLocks = llmqType;
     }
 
+    /**
+     * Allows modifying the LLMQ type for Mnhf.
+     */
+    void UpdateDevnetLLMQMnhf(Consensus::LLMQType llmqType)
+    {
+        consensus.llmqTypeMnhf = llmqType;
+    }
+
     /**
      * Allows modifying PowTargetSpacing
      */
@@ -761,6 +770,7 @@ class CDevNetParams : public CChainParams {
     void UpdateDevnetLLMQInstantSendFromArgs(const ArgsManager& args);
     void UpdateDevnetLLMQInstantSendDIP0024FromArgs(const ArgsManager& args);
     void UpdateDevnetLLMQPlatformFromArgs(const ArgsManager& args);
+    void UpdateDevnetLLMQMnhfFromArgs(const ArgsManager& args);
     void UpdateDevnetPowTargetSpacingFromArgs(const ArgsManager& args);
 };
 
@@ -1321,6 +1331,28 @@ void CDevNetParams::UpdateDevnetLLMQPlatformFromArgs(const ArgsManager& args)
     UpdateDevnetLLMQPlatform(llmqType);
 }
 
+void CDevNetParams::UpdateDevnetLLMQMnhfFromArgs(const ArgsManager& args)
+{
+    if (!args.IsArgSet("-llmqmnhf")) return;
+
+    const auto& llmq_params_opt = GetLLMQ(consensus.llmqTypeMnhf);
+    assert(llmq_params_opt.has_value());
+
+    std::string strLLMQType = gArgs.GetArg("-llmqmnhf", std::string(llmq_params_opt->name));
+
+    Consensus::LLMQType llmqType = Consensus::LLMQType::LLMQ_NONE;
+    for (const auto& params : consensus.llmqs) {
+        if (params.name == strLLMQType) {
+            llmqType = params.type;
+        }
+    }
+    if (llmqType == Consensus::LLMQType::LLMQ_NONE) {
+        throw std::runtime_error("Invalid LLMQ type specified for -llmqmnhf.");
+    }
+    LogPrintf("Setting llmqmnhf to size=%ld\n", static_cast<uint8_t>(llmqType));
+    UpdateDevnetLLMQMnhf(llmqType);
+}
+
 void CDevNetParams::UpdateDevnetPowTargetSpacingFromArgs(const ArgsManager& args)
 {
     if (!args.IsArgSet("-powtargetspacing")) return;

src/chainparamsbase.cpp

@@ -28,6 +28,7 @@ void SetupChainParamsBaseOptions(ArgsManager& argsman)
     argsman.AddArg("-llmqinstantsend=<quorum name>", "Override the default LLMQ type used for InstantSend. Allows using InstantSend with smaller LLMQs. (default: llmq_50_60, devnet-only)", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-llmqinstantsenddip0024=<quorum name>", "Override the default LLMQ type used for InstantSendDIP0024. (default: llmq_60_75, devnet-only)", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-llmqplatform=<quorum name>", "Override the default LLMQ type used for Platform. (default: llmq_100_67, devnet-only)", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
+    argsman.AddArg("-llmqmnhf=<quorum name>", "Override the default LLMQ type used for EHF. (default: llmq_50_60, devnet-only)", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-llmqtestparams=<size>:<threshold>", "Override the default LLMQ size for the LLMQ_TEST quorum (default: 3:2, regtest-only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-llmqtestinstantsendparams=<size>:<threshold>", "Override the default LLMQ size for the LLMQ_TEST_INSTANTSEND quorums (default: 3:2, regtest-only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     argsman.AddArg("-powtargetspacing=<n>", "Override the default PowTargetSpacing value in seconds (default: 2.5 minutes, devnet-only)", ArgsManager::ALLOW_INT, OptionsCategory::CHAINPARAMS);