Add a changelog entry.

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+New: The template variable Utilities::MPI::mpi_type_id_for_type
+provides information about the `MPI_Datatype` that corresponds to a
+given type. This information is necessary in all MPI calls where one
+needs to provide an `MPI_Datatype` to identify the kinds of objects
+stored in a send or receive buffer.
+<br>
+(Wolfgang Bangerth, 2022/02/27)