Create a Morphir to ION Writer.

**Is your feature request related to a problem? Please describe.**

Amazon ION is a data format that is richly-typed and self describing. Many AWS tools including DynamoDb and Redshift target ION.

Being able to produce ION schemas from a Morphir model would be beneficial.

**Describe the solution you'd like**
Provide a `Writer` like interface that allows taking a Morphir model and transforming it to ION.

**Describe alternatives you've considered**

**Additional context**