[ECO-2577] Add calculateCurvePrice function for dexscreener API

[xbtmatt]

Description

Dexscreener indicated that we need to calculate price "on top of reserves", not "on top of swap amounts", so we must add a function to calculate the price given the state of reserves after a swap.

• Add function to calculate the exact, instantaneous price for a market, similar to calculateRealReserves and calculateCirculatingSupply

Testing

• Add tests to verify intuitively that it makes sense
• Add various tests with state transitions, buy/sell, etc.

Checklist

• Did you update relevant documentation?
• Did you add tests to cover new code or a fixed issue?
• Did you update the changelog?
• Did you check all checkboxes from the linked Linear task?

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