fix(typescript): shim tryAddingExtensions to evade ts2876

[Gehbt]

Relate vuejs/language-tools#5957

This PR only change the resolvedModule.resolvedUsingTsExtension to true.

When resolvedModule.resolvedUsingTsExtension is falsy, it will emit ts2876.

// https://github.com/microsoft/TypeScript/blob/main/src/compiler/checker.ts#L4730
function resolveExternalModule(...){
	...
	if (!resolvedModule.resolvedUsingTsExtension && shouldRewrite) {
	 	error(@ts2876);
	}
	...
}

before:

resolve:
tryAddingExtensions -> switch.default -> tryExtension('.d${originalExtension}.ts')
-> return {..., resolvedUsingTsExtension: {someState} && undefined } always falsy

after:

resolve:
tryAddingExtensions -> switch.case extraSupportedExtensions -> tryExtension(extraSupportedExtension, true)
-> return {..., resolvedUsingTsExtension: {someState} && true }