Pool Together changes

[naddison36]

Changes so mStable contracts and functions can be imported into external repos. eg pooltogether-mstable

• Added underlying() function to ISavingsContractV2 interface used by the PoolTogether yield source contract
• Updated from legacy hardhat-typechain to @typechain/hardhat
• Upgraded to latest dependencies including ethers, typechain, hardhat and typescript
• Export functions and types from the package
• Added type definitions to TS config
• moved typescript output from transpiled to dist and added to repo and published package
• Fixed bug in deployMV3 task that was causing type errors with new Typechain version
• Token interface renamed optional savings to vault and added optional saving
• Added rewards task to get COMP and stkAAVE stats

[alsco77]

Solidity looks good

Can you give me a TLDR of the purpose of the dist folder here? If it is for cross repo sharing, we should just run a command during the prepublishOnly script that will add the necessary resources to the dist folder before publish, and this way we can avoid having to commit them to the repo. Should then add to the gitignore IMO so we dont get this bloat during PRs.

What do you think?

[naddison36]

Adding the dist folder was a temporary measure on this branch as I didn't want to publish untested changes to the @mstable/protocol npm package.
Now that version 2.2.0 has been published, I've removed the dist and abis folders from the repo as these are now in the npm package.