KBM - Set up tests for keyboard hook remapping logic (#4004)

* Add test proj, refactor proj with filters, and move single remap function to a separate header

* Moved all methods to header files

* remove more unused commented code

* Reverted sln file

* Fixed sln file

* Added interface wrapping SendInput calls

* fixed formatting

* Created test mock class

* Added keyboard input logic

* Fixed compilation errors and added nuget reference to CppWinRT

* Added tests for single key remapping

* Refactored code for adding shortcut remap tests

* Separated test classes

* Fixed tests in release mode

* Added more tests

* Resolved comments

src/modules/keyboardmanager/common/InputInterface.h

@@ -0,0 +1,13 @@
+#pragma once
+#include "windows.h"
+
+// Interface used to wrap keyboard input library methods
+class InputInterface
+{
+public:
+    // Function to simulate input
+    virtual UINT SendVirtualInput(UINT cInputs, LPINPUT pInputs, int cbSize) = 0;
+
+    // Function to get the state of a particular key
+    virtual bool GetVirtualKeyState(int key) = 0;
+};