feat (hv): custom Uniswap swapper

[robercano]

• Added custom Uniswap swapper with Chainlink Oracle that swaps by using the Oracle price
• Added swapper to deployment when Unsiwap Router is not configured
• Updated all unit tests to use the new swapper
• Updated Hardhat 2.12.2 to try to fix an issue with revert messages: mocha matcher revertedWith is not working anymore when using a local Hardhat node. After brief investigation seems a problem in ethereum-waffle package. The bug has been reported to the team here: https://github.com/TrueFiEng/Waffle/issues/812

[aurelianoB]

Task linked: CU-3rqxu4a Uniswap Custom Swapper