BaseTools: Use pip module if available, CI uses it by default

Use the new edk2-basetools pip module.
Includes a helpful message in setup to let users know which has been
selected.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>

Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Yuwei <Chen<yuwei.chen@intel.com>

Signed-off-by: Matthew Carlson <matthewfcarlson@gmail.com>

BaseTools/toolsetup.bat

@@ -393,12 +393,31 @@ goto end
     goto check_freezer_path
   )
 
+
+
 :check_freezer_path
   endlocal
+
+  %PYTHON_COMMAND% -c "import edk2basetools" >NUL 2>NUL
+  if %ERRORLEVEL% EQU 0 (
+    goto use_pip_basetools
+  ) else (
+    goto use_builtin_basetools
+  )
+
+:use_builtin_basetools
+  @echo Using EDK2 in-source Basetools
   if defined BASETOOLS_PYTHON_SOURCE goto print_python_info
   set "PATH=%BASE_TOOLS_PATH%\BinWrappers\WindowsLike;%PATH%"
   set BASETOOLS_PYTHON_SOURCE=%BASE_TOOLS_PATH%\Source\Python
   set PYTHONPATH=%BASETOOLS_PYTHON_SOURCE%;%PYTHONPATH%
+  goto print_python_info
+
+:use_pip_basetools
+  @echo Using Pip Basetools
+  set "PATH=%BASE_TOOLS_PATH%\BinPipWrappers\WindowsLike;%PATH%"
+  set BASETOOLS_PYTHON_SOURCE=edk2basetools
+  goto print_python_info
 
 :print_python_info
   echo                PATH = %PATH%