Add supportedMediaTypes to the ProducesRequestCondition

[ptahchiev]

If we don't add the supportedMediaTypes from the registered HttpMessageConverters,
then even through the customer might register another httpMessageConverter they won't be able
to get the response in the desired format.

See DATAREST-1235

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[odrotbohm]

Any chance you add some test cases?

[ptahchiev]

Hi @olivergierke I could, however this PR is not complete atm. When I run the tests I see one test is failing as I have described in the ticket comment: https://jira.spring.io/browse/DATAREST-1235
I am really not sure what is the correct way to proceed here - I really need your advice