feat(qt): Expose -coinjoinsessions, -coinjoindenomsgoal and -coinjoindenomshardcap in CoinJoin Options (#5549)

## Issue being fixed or feature implemented
Let GUI users control all CJ params (on the fly) without the need to
edit `dash.conf`.

<img width="643" alt="Screenshot 2023-08-27 at 12 29 07"
src="https://github.com/dashpay/dash/assets/1935069/2d90db0d-c7b2-43a9-9f7f-1c4ad9517408">

## What was done?
Add 3 corresponding spin boxes in Options (with a simple sanity check).
I tried my best to come up with the least confusing labels/tooltips for
these, not sure if I'm 100% happy with the result though.

## How Has This Been Tested?
Run qt wallet, play with values and make sure they are saved/loaded/used
in mixing correctly.

## 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 _(for repository
code-owners and collaborators only)_

---------

Co-authored-by: Konstantin Akimov <knstqq@gmail.com>
Co-authored-by: thephez <thephez@users.noreply.github.com>

Author: 3 people

src/coinjoin/options.cpp

@@ -31,6 +31,12 @@ void CCoinJoinClientOptions::SetMultiSessionEnabled(bool fEnabled)
     options.fCoinJoinMultiSession = fEnabled;
 }
 
+void CCoinJoinClientOptions::SetSessions(int sessions)
+{
+    CCoinJoinClientOptions& options = CCoinJoinClientOptions::Get();
+    options.nCoinJoinSessions = sessions;
+}
+
 void CCoinJoinClientOptions::SetRounds(int nRounds)
 {
     CCoinJoinClientOptions& options = CCoinJoinClientOptions::Get();
@@ -43,6 +49,18 @@ void CCoinJoinClientOptions::SetAmount(CAmount amount)
     options.nCoinJoinAmount = amount;
 }
 
+void CCoinJoinClientOptions::SetDenomsGoal(int denoms_goal)
+{
+    CCoinJoinClientOptions& options = CCoinJoinClientOptions::Get();
+    options.nCoinJoinDenomsGoal = denoms_goal;
+}
+
+void CCoinJoinClientOptions::SetDenomsHardCap(int denoms_hardcap)
+{
+    CCoinJoinClientOptions& options = CCoinJoinClientOptions::Get();
+    options.nCoinJoinDenomsHardCap = denoms_hardcap;
+}
+
 void CCoinJoinClientOptions::Init()
 {
     assert(!CCoinJoinClientOptions::_instance);

src/coinjoin/options.h

@@ -61,8 +61,11 @@ class CCoinJoinClientOptions
 
     static void SetEnabled(bool fEnabled);
     static void SetMultiSessionEnabled(bool fEnabled);
+    static void SetSessions(int sessions);
     static void SetRounds(int nRounds);
     static void SetAmount(CAmount amount);
+    static void SetDenomsGoal(int denoms_goal);
+    static void SetDenomsHardCap(int denoms_hardcap);
 
     static bool IsEnabled() { return CCoinJoinClientOptions::Get().fEnableCoinJoin; }
     static bool IsMultiSessionEnabled() { return CCoinJoinClientOptions::Get().fCoinJoinMultiSession; }

src/interfaces/node.h

@@ -82,13 +82,19 @@ namespace CoinJoin {
 class Options
 {
 public:
+    virtual int getSessions() = 0;
     virtual int getRounds() = 0;
     virtual int getAmount() = 0;
+    virtual int getDenomsGoal() = 0;
+    virtual int getDenomsHardCap() = 0;
 
     virtual void setEnabled(bool fEnabled) = 0;
     virtual void setMultiSessionEnabled(bool fEnabled) = 0;
+    virtual void setSessions(int sessions) = 0;
     virtual void setRounds(int nRounds) = 0;
     virtual void setAmount(CAmount amount) = 0;
+    virtual void setDenomsGoal(int denoms_goal) = 0;
+    virtual void setDenomsHardCap(int denoms_hardcap) = 0;
 
     virtual bool isMultiSessionEnabled() = 0;
     virtual bool isEnabled() = 0;

src/node/interfaces.cpp

@@ -125,6 +125,10 @@ namespace CoinJoin = interfaces::CoinJoin;
 class CoinJoinOptionsImpl : public CoinJoin::Options
 {
 public:
+    int getSessions() override
+    {
+        return CCoinJoinClientOptions::GetSessions();
+    }
     int getRounds() override
     {
         return CCoinJoinClientOptions::GetRounds();
@@ -133,6 +137,14 @@ class CoinJoinOptionsImpl : public CoinJoin::Options
     {
         return CCoinJoinClientOptions::GetAmount();
     }
+    int getDenomsGoal() override
+    {
+        return CCoinJoinClientOptions::GetDenomsGoal();
+    }
+    int getDenomsHardCap() override
+    {
+        return CCoinJoinClientOptions::GetDenomsHardCap();
+    }
     void setEnabled(bool fEnabled) override
     {
         return CCoinJoinClientOptions::SetEnabled(fEnabled);
@@ -141,6 +153,10 @@ class CoinJoinOptionsImpl : public CoinJoin::Options
     {
         CCoinJoinClientOptions::SetMultiSessionEnabled(fEnabled);
     }
+    void setSessions(int sessions) override
+    {
+        CCoinJoinClientOptions::SetSessions(sessions);
+    }
     void setRounds(int nRounds) override
     {
         CCoinJoinClientOptions::SetRounds(nRounds);
@@ -149,6 +165,14 @@ class CoinJoinOptionsImpl : public CoinJoin::Options
     {
         CCoinJoinClientOptions::SetAmount(amount);
     }
+    void setDenomsGoal(int denoms_goal) override
+    {
+        CCoinJoinClientOptions::SetDenomsGoal(denoms_goal);
+    }
+    void setDenomsHardCap(int denoms_hardcap) override
+    {
+        CCoinJoinClientOptions::SetDenomsHardCap(denoms_hardcap);
+    }
     bool isEnabled() override
     {
         return CCoinJoinClientOptions::IsEnabled();