Record type locations for definition files types (AstDeclaredClassProp and AstStatDeclareFunction)

[JohnnyMorganz]

Props in AstStatDeclareClass currently do not record their typeLocations in the property type created, like AstTypeTables do (following on from #802):

luau/Analysis/src/TypeInfer.cpp

Lines 1782 to 1805 in e76802f

	if (assignTo.count(propName) == 0)
	{
	assignTo[propName] = {propTy};
	}
	else
	{
	TypeId currentTy = assignTo[propName].type();
	// We special-case this logic to keep the intersection flat; otherwise we
	// would create a ton of nested intersection types.
	if (const IntersectionType* itv = get<IntersectionType>(currentTy))
	{
	std::vector<TypeId> options = itv->parts;
	options.push_back(propTy);
	TypeId newItv = addType(IntersectionType{std::move(options)});
	assignTo[propName] = {newItv};
	}
	else if (get<FunctionType>(currentTy))
	{
	TypeId intersection = addType(IntersectionType{{currentTy, propTy}});
	assignTo[propName] = {intersection};
	}

It seems that there is no position stored in the Ast for AstDeclaredClassProp, so that will need to be added first.

Likewise, the FunctionType produced via AstStatDeclareFunction does not record a FunctionDefinition:

luau/Analysis/src/TypeInfer.cpp

Line 1836 in e76802f

TypeId fnType = addType(FunctionType{funScope->level, std::move(genericTys), std::move(genericTps), argPack, retPack});

These missing locations makes it difficult to find the location in a definitions file where these types are declared. These locations are useful to power Go To Definition functionality and documentation comments inlined in definitions files.