refactoring: move platform, winutils, macutils to platform submodule (#5549)

https://github.com/xonsh/xonsh/issues/5538
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---------

Co-authored-by: a <1@1.1>

pyproject.toml

@@ -29,6 +29,7 @@ packages = [
     "xonsh.ply.ply",
     "xonsh.ptk_shell",
     "xonsh.procs",
+    "xonsh.platform",
     "xonsh.parsers",
     "xonsh.xoreutils",
     "xontrib",
@@ -252,7 +253,7 @@ convention = "numpy"
 "xonsh/xonfig.py" = ["E731"]
 "xontrib/vox.py" = ["F821"]
 "xonsh/inspectors.py" = ["E722"]
-"xonsh/platform.py" = ["F401"]
+"xonsh/platform/__init__.py" = ["F401"]
 "xonsh/parsers/*.py" = [
     "E741", #  E741 Ambiguous variable name
 ]

xonsh/aliases.py

@@ -980,7 +980,7 @@ def make_default_aliases():
             default_aliases["deactivate"] = ["source-cmd", "deactivate.bat"]
         if shutil.which("sudo", path=XSH.env.get_detyped("PATH")):
             # XSH.commands_cache is not available during setup
-            import xonsh.winutils as winutils
+            import xonsh.platform.winutils as winutils
 
             def sudo(args):
                 if len(args) < 1:

xonsh/lazyimps.py

@@ -67,7 +67,7 @@ def msvcrt():
 @lazyobject
 def winutils():
     if ON_WINDOWS:
-        import xonsh.winutils as m
+        import xonsh.platform.winutils as m
     else:
         m = None
     return m
@@ -76,7 +76,7 @@ def winutils():
 @lazyobject
 def macutils():
     if ON_DARWIN:
-        import xonsh.macutils as m
+        import xonsh.platform.macutils as m
     else:
         m = None
     return m