feat(target_chains/ethereum): implement TWAP calculation directly in Pyth contract

[cctdaniel]

Summary

Migrated calculateTwap function from PythUtils.sol to Pyth.sol and removed the external dependency on PythUtils library. The function implementation remains identical but is now directly part of the Pyth contract.

Rationale

• Reduces external dependencies by internalizing the TWAP calculation logic
• Simplifies deployment process by removing need to deploy and link the PythUtils library

How has this been tested?

• Current tests cover my changes
  • The existing test suite covers TWAP calculation functionality
  • No behavioral changes were made to the code, only moved location
• Added new tests
  • Not needed as functionality remains unchanged
• Manually tested the code
  • Verified the function signature and implementation match exactly
  • Confirmed removal of PythUtils import and dependency

The changes are purely organizational - moving code from an external library to the main contract without modifying the implementation. All existing tests that exercise TWAP functionality will continue to work as before since the calculation logic remains identical.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 24, 2025 4:00am

5 Skipped Deployments

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component-library	⬜️ Ignored (Inspect)	Visit Preview		Apr 24, 2025 4:00am
entropy-debugger	⬜️ Ignored (Inspect)	Visit Preview		Apr 24, 2025 4:00am
insights	⬜️ Ignored (Inspect)	Visit Preview		Apr 24, 2025 4:00am
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