Code folding with `//#region` and `//#endregion`

Type: Feature Request

Please make //#region and //#endregion folding available on VSCode for C/C++ too.

Feature request suggested by @Colengms in https://github.com/microsoft/vscode/issues/123016#issuecomment-837074185_

The documentation describes that C/C++ region should be defined with #pragma region and #pragma endregion, although many C/C++ application complain about unknown pragma, generating many warnings. In the very same documentation, the default for many languages is //#region and //#endregion which is definitely the very best choice for C/C++. There are VS Code extensions like this that try to fix these annoying issue, but they create other problems, since single line comments should never use /* */, it makes harder to comment out a block with regions inside.

• Using #pragma region almost always require to disable unknown pragmas with the compiler flag -Wno-unknown-pragmas, which may hide useful warnings such as the typo #pragma ocne.
• GCC is one of the most famous compiler, and still there are recently complaining about the need to disable unknown pragmas in order to use #pragma region.
• There are even cases of compilations bugs with the use of #pragma region such as this. Which would never happen if //#region would be a default.
• The number of people trying to find workarounds are getting ridiculous at this point, there are people even using #ifndef MY_REGION_NAME ... #endif, which may lead to pieces of code being ignored by the compiler if the region is a duplicate name.
• This issue uses an example of C/C++ where it tries the intuitive region folding (#region inside line comment), but VSCode fails to fold, since #pragma region should have been used instead.

VS Code version: Code 1.55.2 (3c4e3df, 2021-04-13T09:35:57.887Z)
OS version: Windows_NT x64 6.1.7601
ms-vscode.cpptools Version 1.3.1: April 19, 2021

Start with the C/C++ folding support in the extension and compare its handling with the region syntax described in the VS Code codebasics documentation and the linked folding examples. Done means //#region and //#endregion fold correctly for C/C++ without requiring #pragma directives, with behavior verified in the extension.