Ship conpty.dll/OpenConsole.exe with opt-in experimental option useConptyDll

[Tyriar]

This also includes header files for node v20.14.0 so that go to def/etc. work in the C++ vscode extension.

Part of microsoft/vscode#224488

[deepak1556]

@Tyriar why not point to the node-gyp which your installation of node uses instead of bundling it in the repo ?

[Tyriar]

@deepak1556 how would you do that in a portable way as node could be installed anywhere?

[deepak1556]

Prefer compile_commands which makes intellisense work on the header and library paths specified to the compiler at build time. The c++ extensions seems to support it https://code.visualstudio.com/docs/cpp/c-cpp-properties-schema-reference#_configuration-properties. Most build systems out there should support generating this file. For node-gyp refer to nodejs/node-gyp#1526

The dependency added in this PR will be hard to maintain and quickly go out of sync, it would be best if we avoid syncing it to the repo.

[Tyriar]

I only realized it was a million lines after merging 😅