MediaType.isCompatible does not recognize media types with composite subtypes

application/xml+bar is compatible with application/xml+* but MediaType.isCompatible will return false on these types.

The method will need to do one extra check, "|| typesAreEqual and bothSubTypesContainPlus, if yes - split both subtypes, the values before '+' must be equal, afterwards either equal or one of them is a wildcard".

application/*+bar and application/xml+bar might also be checked - though the former case is probably more interesting/more real world one...
#### Affected Versions
[2.0]

Start at the MediaType.isCompatible entry point and inspect how subtype equality and wildcards are currently handled. Verify composite subtypes such as application/xml+bar with application/xml+* and application/*+bar, then add or update coverage so matching prefixes and compatible suffixes are accepted while incompatible values remain false.

Written by the indexing model from the issue text.