Create JavascriptString variable from Utf16 string

CHAKRA_API    JsCreateStringUtf16(        _In_ const uint16_t *content,        _In_ size_t length,        _Out_ JsValueRef *value);

• content: Pointer to string memory.
• length: Number of bytes within the string
• value: JsValueRef representing the JavascriptString

The codeJsNoError if the operation succeeded, a failure code otherwise.

This API is experimental and may have breaking change later.

Requires an active script context.

Expects Utf16 string.