pystac v2 extension class experiments
# Context
## What is useful about pystac extension classes?
For writing:
- easy extension value assignment on a STAC object
- apply the same extension values to many STAC objects
- on the fly validation of extension values
For updating:
- migrating extension values
For reading:
- intuitive exploration of extension values
## What is annoying about pystac extension classes?
- Writing a new class is fiddly and hard to get right, lots of boilerplate
- Updating to a new version is also fiddly
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