This overload has significant impact on overload resolution. Consider these
overloads:
```cpp
void to_string(AZStd::string& dest, AZStd::wstring_view src);
void to_string(string& str, bool value);
```
And then calling code like this:
```
WCHAR src[260];
AZStd::string dst;
AZStd::to_string(dst, src); // Which overload does this call?
```
If the .cpp has not included `MCore/Source/StringConversions.h`, the call
to `to_string()` will convert the `WCHAR[260]` type to a
`AZStd::wstring_view`, and call the first overload. But if
`StringConversions.h` _has_ been included, the implicit conversion of
`WCHAR[260]` to `bool` has a higher precedence, and it will be chosen
instead.
This overload was causing some uses of `to_string` in
`AnimGraph/GameController.cpp` to resolve to the wrong overload in unity
builds.
Signed-off-by: Chris Burel <burelc@amazon.com>
Chris Burel
3d0a15f009