Simplify MediaTypeRequestMatcher construction

[jzheaux]

MediaTypeServerWebExchangeMatcher is very easy to use because it simply takes a list of MediaTypes in its constructor:

public MediaTypeServerWebExchangeMatcher(MediaType... mediaTypes) {
    // ...
}

However, MediaTypeRequestMatcher, the servlet equivalent, requires the user to supply a ContentNegotiationStrategy as well:

public MediaTypeRequestMatcher(ContentNegotiationStrategy contentNegotiationStrategy,
    MediaType... mediaTypes) {
    // ...
}

It would be nice if MediaTypeRequestMatcher were as easy to use as MediaTypeServerWebExchangeMatcher.

[clevertension]

@jzheaux are you working on this issue?if not, i think i can provide a PR 😁😁

[jzheaux]

It's yours, @clevertension. Note that I'll assign it to myself, just so I can keep track of it now that it's being worked on.

[clevertension]

@jzheaux so the ContentNegotiationStrategy contentNegotiationStrategy can be null now?

[jzheaux]

@clevertension I was thinking that the class could default to a HeaderContentNegotiationStrategy. See the JavaDoc for some common usages.