feat: handle WM_LBUTTONDOWN WM_LBUTTONUP in Win32

[H999]

Recently, I have been using your repo and noticed that it does not support WM_LBUTTONDOWN and WM_LBUTTONUP events in Win32. While searching through the SDL library, I found that these events can be supported by enabling SDL_EventState(SDL_SYSWMEVENT, SDL_ENABLE). I tested this on my device, and it worked stably and met my needs. However, I'm not sure if there could be any negative consequences from using it more widely. Could you consider enhancing the functionality in your repo to include this, as well as potentially other related features?

Here my tested code and I tested with SamSung touch screen diagnostic (SamSung M21):

hwnd = win32gui.FindWindow(None, "")
x=400
y=400
win32gui.PostMessage(hwnd, win32con.WM_LBUTTONDOWN, 0, (y << 16) | x)
win32gui.PostMessage(hwnd, win32con.WM_LBUTTONUP, None, (y << 16) | x)