IDebuggableProcess: Create and expose interface to enable implementation of debugging tools

# Conflicts:
#	src/ARMeilleure/State/DebugState.cs
#	src/ARMeilleure/State/ExecutionContext.cs
TODO: Fix comments. I also tried implementing AppleHV primitives here (it's actually broken).

src/Ryujinx.Cpu/AppleHv/IHvExecutionContext.cs

@@ -39,5 +39,13 @@ namespace Ryujinx.Cpu.AppleHv
                 SetV(i, context.GetV(i));
             }
         }
+
+        void RequestInterrupt();
+        bool GetAndClearInterruptRequested();
+
+        // TODO: comments
+        void DebugStop();
+        bool DebugStep();
+        void DebugContinue();
     }
 }