Description
Swappa provides smart contracts and a javascript library that allows consumers to find and execute trades on CELO at the best price.

Swappa includes an interface ISwappaPair that provides an abstraction over a "connector" to a specific dex and exposes methods to get the expected output amount and execute a swap.

Swappa contains an existing contract PairMento that implements the ISwappaPair interface and enables the retrieval and swaps using Mento exchanges.

As Swappa is fully open source we can add a new contract, PairMentoV2, that implements the ISwappaPair interfaces and allows the swappa router to query and execute swaps against MentoV2.

TODO: @bayological
Look into how TS classes are used and determine how to create a new class MentoV2.ts that provides necessary functions. Maybe ask ZViad or DiWu about this, may be as simple as inheriting from Pair and implementing base functions.

Acceptance Criteria

• A new contract PairMentoV2, that implements ISwappaPair is created and allows consumers to query the broker for prices and execute trades on behalf of the user
• The new contract is deployed, with its address added to a new json file in tools/deployed