feat(target_chains/ethereum): add twap

[cctdaniel]

Summary

• Added comprehensive TWAP (Time-Weighted Average Price) functionality to the Pyth contract system including:
  • New data structures: TwapPriceFeed, TwapPriceInfo, TwapPriceFeedMessage
  • New methods for TWAP calculations and updates
  • Optimized fee structure for TWAP updates
  • Added extensive test coverage including negative test cases
• Added new error types for TWAP-related validation

Rationale

These changes are necessary to:

1. Support TWAP price feed calculations which provide more stable price data by averaging over time
2. Improve UX by optimizing fee structure (charging for single update instead of both updates)
3. Ensure robust error handling for TWAP-related operations
4. Keep dependencies up to date for security and compatibility
5. Maintain code quality through comprehensive test coverage

How has this been tested?

• Current tests cover my changes
• Added new tests
• Manually tested the code

Testing steps:

1. Added comprehensive positive test case for TWAP calculation verifying:

   • Basic properties (ID, timestamps, exponents)
   • Price calculations
   • Confidence calculations
   • Down slots ratio

2. Added extensive negative test cases covering:

   • Invalid update data length
   • Mismatched price IDs
   • Invalid time ordering
   • Mismatched exponents
   • Invalid previous publish times
   • Insufficient fees

3. Manually verified:

   • TWAP calculation accuracy
   • Fee optimization changes
   • Error handling
   • Event emissions
   • Integration with existing price feed functionality

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 10, 2025 2:14pm

5 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
component-library	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 2:14pm
entropy-debugger	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 2:14pm
insights	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 2:14pm
proposals	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 2:14pm
staking	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 2:14pm

[ali-behjati]

Very nice. I left some comments that are mostly minor but I like to see them addressed before approving.

[ali-behjati]

Nice!

[tejasbadadare]

LGTM!