Early support for Jakarta Servlet 6.2 and Jakarta Activation 2.2

[jhoeller]

Jakarta Servlet 6.2 introduces a new sendEarlyHints() method on HttpServletResponse, and Jakarta Activation 2.2 introduces a getContentType(Path) method on FileTypeMap. We can easily declare both of those additions while retaining a Servlet 6.1 and Activation 2.1 baseline.