refactoring: revert platform moving to backwards compatibility (#5564)

Consensus with #5549 
cc #5538

## For community
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---------

Co-authored-by: a <1@1.1>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

pyproject.toml

@@ -31,7 +31,7 @@ packages = [
     "xonsh.shells.ptk_shell",
     "xonsh.parsers.ply",
     "xonsh.procs",
-    "xonsh.platform",
+    "xonsh.platforms",
     "xonsh.parsers",
     "xonsh.xoreutils",
     "xontrib",

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.platform.winutils as winutils
+            import xonsh.platforms.winutils as winutils
 
             def sudo(args):
                 if len(args) < 1:

xonsh/lib/lazyimps.py

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

xonsh/platforms/__init__.py

@@ -0,0 +1 @@
+"""Platform-dependent code."""