[SDK] Improve wincon.h and add wincon_undoc.h (#8019)

- Add missing WINBASEAPI modifiers.
- Update/add missing SAL annotations.
- Add missing function argument names.
- Only keep public definitions there.
- Move private/undocumented ones in a new wincon_undoc.h

This header is based on the following resources:
- https://undoc.airesoft.co.uk/kernel32.dll/
- https://github.com/microsoft/terminal/blob/main/dep/Console/ntcon.h
- https://github.com/microsoft/terminal/blob/main/dep/Console/winconp.h
  (commit f08321a0b2)

CODEOWNERS

@@ -167,6 +167,8 @@
 /drivers/base/condrv/                       @HBelusca
 /drivers/setup/blue/                        @HBelusca
 /modules/rostests/winetests/kernel32/console.c  @HBelusca
+/sdk/include/psdk/wincon.h                  @HBelusca
+/sdk/include/reactos/wincon_undoc.h         @HBelusca
 /sdk/include/reactos/drivers/condrv/        @HBelusca
 /sdk/include/reactos/drivers/blue/          @HBelusca
 /sdk/include/reactos/subsys/win/conmsg.h    @HBelusca