Introduce global llmq::llmqDb instance of CDBWrapper

This DB is for LLMQ related data that is not part of on-chain consensus.
This for example included LLMQ secret key shares and recovered signatures.

src/llmq/quorums_init.cpp

@@ -14,15 +14,20 @@
 #include "quorums_signing.h"
 #include "quorums_signing_shares.h"
 
+#include "dbwrapper.h"
 #include "scheduler.h"
 
 namespace llmq
 {
 
 static CBLSWorker blsWorker;
 
+CDBWrapper* llmqDb;
+
 void InitLLMQSystem(CEvoDB& evoDb, CScheduler* scheduler, bool unitTests)
 {
+    llmqDb = new CDBWrapper(unitTests ? "" : (GetDataDir() / "llmq"), 1 << 20, unitTests);
+
     quorumDKGDebugManager = new CDKGDebugManager(scheduler);
     quorumBlockProcessor = new CQuorumBlockProcessor(evoDb);
     quorumDKGSessionManager = new CDKGSessionManager(evoDb, blsWorker);
@@ -51,6 +56,8 @@ void DestroyLLMQSystem()
     quorumBlockProcessor = nullptr;
     delete quorumDKGDebugManager;
     quorumDKGDebugManager = nullptr;
+    delete llmqDb;
+    llmqDb = nullptr;
 }
 
 void StartLLMQSystem()

src/llmq/quorums_init.h

@@ -5,6 +5,7 @@
 #ifndef DASH_QUORUMS_INIT_H
 #define DASH_QUORUMS_INIT_H
 
+class CDBWrapper;
 class CEvoDB;
 class CScheduler;
 
@@ -14,6 +15,8 @@ namespace llmq
 // If true, we will connect to all new quorums and watch their communication
 static const bool DEFAULT_WATCH_QUORUMS = false;
 
+extern CDBWrapper* llmqDb;
+
 // Init/destroy LLMQ globals
 void InitLLMQSystem(CEvoDB& evoDb, CScheduler* scheduler, bool unitTests);
 void DestroyLLMQSystem();