Feature: Support indexing comments (issues and discussions)

[jpmcb]

Type of feature

🍕 Feature

Current behavior

We don't index any kinds of comments (within issues, on individual commits, in discussions, etc.)

This is a pretty broad category, but if we want to track comment contributions, we'll need to be able to index and track comments generally.

Suggested solution

Ideally we'd find a way to scrape most comments and drop them into a database table that can have foreign keys to the specific issue / discussion / repo / author / etc.

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Related to: https://github.com/open-sauced/api/issues/322

Also related to feature asks in: https://github.com/open-sauced/app/pull/1594

Additional context

No response

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