Support pydantic

[antonagestam]

• Implement Phantom.__get_validators__.
• Implement __modify_schema__ in at least some of the builtin types.
• Make phantom sized able to parse mutable collections Parse mutable sized containers into tuple/immutables.Map #110
• Introduce BoundedSize, see Excellent pydantic support for sized containers #111
• Fully support sub-types of phantom sized types in schemas, see Excellent pydantic support for sized containers #111