Support adding source/header extensions for Switch Header/Source functionality

[rewrking]

• OS and Version: Windows 10
• VS Code Version: 1.40.1
• C/C++ Extension Version: 0.26.2-insiders

I have a codebase I'm writing right now where template implementation code is split up into .inl files (also typically used for inline/constexpr functions). While they're mainly just to keep header files "clean", I was thinking it would be nice to be able to swap to them from the header files themselves via the Switch Header/Source command.

I can see it either being implemented as swapping between 3 files with the same name if they exist (h/hpp,cpp,inl), or favoring just the header/source file swap if the source file exists, and header/inline file if an inl exists,

typical pattern:
(with all 3 files, a lot of cases could be just .hpp/.inl)

InlTest.hpp

#ifndef INL_TEST_H
#define INL_TEST_H

struct InlTest
{
	void foo(const int& inFoo);

	template <typename T>
	void bar(const T& inBar);
};

#include "InlTest.inl"

#endif // INL_TEST_H

InlTest.cpp

#include "inlTest.hpp"

void InlTest::foo(const int& inFoo);
{
	std::cout << inFoo << std::endl;
}

InlTest.inl

#include "inlTest.hpp" // Actually not needed, but helps with intellisense sometimes

#include <iostream>

template <typename T>
void InlTest::bar(const T& inBar);
{
	std::cout << inBar << std::endl;
}

Out of the file types supported by the builtin C/C++ extension, the following could also be candidates for this toggle too:

.i .ii .ino .inl .ipp .hpp.in .h.in

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[github-actions]

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[SteelBlueVision]

This is such a common sense, must have request for any C++ development, that I am surprised it isn't given the absolute highest priority for implementation.