Add metrics with spark lines!

[mkleinbort]

Checklist

• I have searched the existing issues for similar feature requests.
• I added a descriptive title and summary to this issue.

Summary

Looking to emulate:

Or

Why?

The idea being to show a metric's evolution over time.

How?

This would either be a new component or a configuration of st.metric

Additional Context

No response

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[jrieke]

Lol we literally just discussed this internally last week! I think we should definitely do this at some point. Will prioritize when this gets more upvotes!