Windows: Create installer and environment

* Add 'make-installer' command for Windows

* Add '--bat' arg to env activate, env deactivate and unload commands

* An equivalent script to setup-env on linux: spack_cmd.bat. This script
has a wrapper to evaluate cd, load/unload, env activate/deactivate.(#21734)

* Add spacktivate and config editor (#22049)

* spack_cmd: will find python and spack on its own. It preferentially
tries to use python on your PATH (#22414)

* Ignore Windows python installer if found (#23134)

* Bundle git in windows installer (#23597)

* Add Windows section to Getting Started document
(#23131), (#23295), (#24240)

Co-authored-by: Stephen Crowell <stephen.crowell@kitware.com>
Co-authored-by: lou.lawrence@kitware.com <lou.lawrence@kitware.com>
Co-authored-by: Betsy McPhail <betsy.mcphail@kitware.com>
Co-authored-by: Jared Popelar <jpopelar@txcorp.com>
Co-authored-by: Ben Cowan <benc@txcorp.com>

Update Installer CI

Co-authored-by: John Parent <john.parent@kitware.com>

.gitignore

@@ -269,6 +269,11 @@ local.properties
 # CDT-specific (C/C++ Development Tooling)
 .cproject
 
+# VSCode files
+.vs
+.vscode
+.devcontainer
+
 # CDT- autotools
 .autotools