Indicates if a given metadata is included in the current one. The test is true if both metadata are equal or if the given metadata is within the range of the current one. For example, {@link MediaType#ALL} includes allmedia types.
Examples:
- TEXT_ALL.includes(TEXT_PLAIN) -> true
- TEXT_PLAIN.includes(TEXT_ALL) -> false
@param included The metadata to test for inclusion.
@return True if the given metadata is included in the current one.
@see #isCompatible(Metadata)