generic seralization api needs to be reworked

To serialize / deserialize, the docs show we need to declare a `zfp::array::header` instance, however it is now an abstract class:

```
'zfp::array::header' is an abstract class
zfp::array::header header;
```

https://zfp.readthedocs.io/en/release1.0.0/arrays.html#serialization-1

For 1.0, the ZFP api changed to use concrete dimensioned types -- and this change undermined the generic seralization cases (using base `zfp::array::header` and `zfp::array`)

Start with the serialization example in the linked ZFP 1.0 documentation and inspect how the generic zfp::array::header and zfp::array interfaces are used. Determine the replacement generic serialization API and verify that the documented serialization and deserialization cases work without instantiating the abstract header type.

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