[Reopen] Fix ANCM installer on ARM64

[lextm]

Revised ASP.NET Core module installers for Windows ARM64

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• Switch to LoadLibraryEx with LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR flag set, so that the pure forwarder works as desired.
• Add ARM64X pure forwarders.
• Revise WiX installers to use ARM64X pure forwarders

Fixes #47115.

Description

About the change in HandlerResolver.cpp

To implement all proposed installer changes in #47115, then in the out-of-process folder three files present,

1. aspnetcorev2_outofprocess.dll, an ARM64X pure forwarder.
2. aspnetcorev2_outofprocess_arm64.dll, the pure ARM64 handler.
3. aspnetcorev2_outofprocess_x64.dll, the x64 handler.

Before this change, LoadLibrary only loads the pure forwarder, but then scans the default folders (the dll folder is not included) to load the actual handler which obviously fails.

After this change, LoadLibraryEx can pick up the correct handler as the dll folder is added in the search folder list.

About files in Forwarders folder

Source code for the two ARM64X pure forwarders.

About changes in ANCMV2 folder

Before this change, only ARM64 web apps can run on IIS.

After this change, the new file structure enables ARM64/x64/x86 side by side execution on IIS.

About changes in ANCMIISEXpressV2 folder

Before this change, only ARM64 web apps can run on IIS Express.

After this change, the new file structure enables ARM64/x64/x86 side by side execution on IIS Express.

[dotnet-policy-service]

Hey @dotnet/aspnet-build, looks like this PR is something you want to take a look at.