Generalize IDeserializer to ISerializer

[pnwpedro]

Description

This extends the IDeserializer interface to include both Serialize and Deserialize without fundamentally changing any implementation.

• Rename IDeserializer to ISerializer
• Add Serialize method to ISerializer
• Move Serializer.Serialize to DynamicSerializer.Serialize
• Stub Serialize methods on every other Serializer (to be implemented)

Motivation and context

This prepares us for,

1. encapsulating serialize and deserialize behaviors for individual types to their own classes,
2. exposing an extensible API so that users can register serialize/deserialize behaviors for custom types

How was the change tested?

All existing tests pass.

Screenshots (if appropriate):

N/A

Change types

• [ ] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [X] Breaking change (backwards-incompatible fix or feature)

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to Fauna documentation.
• [ ] My change requires a change to the README, and I have updated it accordingly.