Static handler options for max age by media type or file extension

[tsegismont]

The static handler can be configured with setMaxAgeSeconds to define a default value for caching headers.

This value will be used for any file regardless of its content type or extensions.

In projects were the frontend assets are created with a framework (e.g React/Vuejs), javascript and css files have their names changed by the build. It is fine to have browsers cache them longer (e.g one year).

So being able to configure the max age depending on the file extension or media type would help.

[tsegismont]

@pmlopes wdyt ?