Feature: implement workspace "contributions quality" histogram

[jpmcb]

Type of feature

🍕 Feature

Current behavior

Related to https://github.com/open-sauced/api/issues/585 and

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We want to implement a time series of data for "contributions quality"

Suggested solution

TODO - this is loosely based on exploratory work done in: https://github.com/open-sauced/engineering/issues/37

Additional context

No response

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