Quoter contract with view methods

[134dd3v]

Summary

This is a proposal to add a Quoter contract with interface similar to the existing Quoter contract just that the quote functions are view.

The contract in this PR was created simply by duplicating the existing quoter contract and replacing the try catch pool.swap logic with the simulate swap. Simulate library in v3-core repo which makes it feasible to have quotes under a staticcall / view function. This contract is tentatively named as QuoterV3 and it passes all the tests written for Quoter contract.

Rationale

• Quoter and QuoterV2 contracts contain non-view quote functions. They have been intended to be consumed off-chain, however for on-chain quotes, devs either have to use Simulate library from v3-core repo (which bring in sqrt price mumbo jumbo) or just use the Quoter contracts for simplicity.
• Devs implementing standards like ERC4626 which involve functions that restrict the state mutability to "view", face issues while integrating UniswapV3 if they need quotes for multi-hop swaps. Writing logic in their codebase increases lines of code and hence audit costs.
• If Uniswap team can maintain a view quoter contract, it would improve DX while integrating UniswapV3. This can be a potential public good for Uniswap community.

Please lmk if any changes are required to be done in this PR.

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

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