Feat/ Tezos and Plenty

These 2 PRs introduce new support for the Tezos chain and a new connector for Plenty. This addition will allow us to run bots on Plenty AMM and also enable other developers to add support for more AMMs on the Tezos chain.

Here are the relevant links to know more: Tezos: https://tezos.com/ Plenty: https://plenty.network/ PR #6475 on the hummingbot repo: https://github.com/hummingbot/hummingbot/pull/6475 PR #156 on the gateway repo: https://github.com/hummingbot/gateway/pull/156