ot::MeshCoP::Dataset::AppendTlvsFrom() method

kErrorNone Successfully merged TLVs from @p Dataset into this Dataset. kErrorNoBufs Could not append the TLVs due to insufficient buffer space.

Unlike `WriteTlvsFrom()`, this method does not validate the @p aTlvs to be well-formed or check that there are no duplicates. It is up to caller to validate the resulting `Dataset` (e.g., using `ValidateTlvs()`) if desired.