fix(classification): add data type to classification

[elsapet]

Description

Add data type to schema classification object

Also some refactoring / clean up of schema classification, namely:

• Nest data type in classification / object patterns
• Return DataTypable in classification object (instead of casting to a data type)
• Pull out some private methods from schema classify method
• Pull out some helper methods from schema classification file to a new classify_schema util
• Change data type UUIDs to strings for simplicity (this is what we're using elsewhere in Curio for UUIDs)
• Some refactoring of schema classification methods

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format

[swarmia]

✅  Linked to AMA-3088 · Add data type UUID to schema classification
➡️  Part of AMA-3023 · Backport schema (data type) classification from ruby app
➡️  Part of AMA-2947 · OSS - Curio CLI