Simplify Metadata handling

[AlexejPenner]

Describe changes

The fact that run metadata is stored in a separate table with a row per key-value pair is business logic. I don't see the benefit of exposing this to the user/client. As a user when I run model_version.run_metadata i expect to get a simple
metadata dictionary, instead I get a fulminant RunMetadataResponseBody.

On top of that, the run_metadata lead to bloating of the api response sizes.

Example response body:
response_1729171061701.json

Time to list 100 hydrated model versions with the state on develop:

Time to list 100 hydrated model versions after this change:

Breaking Change

All code that accesses run_metadata now needs to be changed:

metadata_value = current_model_version.run_metadata["key"].value

-->

metadata_value = current_model_version.run_metadata["key"]

Metadata is now a familiar python dictionary.

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

[github-actions]

Classification template updates in examples/mlops_starter have been pushed.

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[schustmi]

A more general comment: Do you think it makes sense to remove these run_metadata attributes on all the responses to just metadata? Especially run.run_metadata seems very weird, and now that we're already breaking this by changing the type, might be a good opportunity to take a look at the names as well?

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[AlexejPenner]

🦭