Implementing Loom Provider 2 (WebSocket + JSON RPC)

[eduardonunesp]

• Depends on Loomchain eth_sendRawTransaction eth_sendRawTransaction modified to support ethereum transactions loomchain#1227
• Update e2e configs with new Loomchain configs
• Replicate tests from original Loom Provider
• Import code from test branch
• Use stable version of Web3 1.2.1 (WebsocketProvider) as reference
• Loom Provider 2 using WebSocket as default
• WebSocket communication and eth_subscribe/eth_unsubscribe tracking by Loom Provider 2
• Adding retry strategies like original Loom Provider
• Wallet management on ethers/Wallet
• Signed transaction from ethers/Wallet
• JSON RPC documentation on Loom Developers Site (https://loomx.io/developers/en/json-rpc-methods.html)

[enlight]

The main difference between the current version of LoomProvider and this new one is that this one is meant to work more like a wallet provider, similar to the HD wallet provider (https://www.trufflesuite.com/tutorials/using-infura-custom-provider). It interacts directly with the /eth endpoint on Loom nodes (and only that endpoint), both for querying and sending txs, the latter requires loomnetwork/loomchain#1227.

[eduardonunesp]

Totally agree with you, the LoomProvider2 right now is doing that the accounts and sign the transactions are happening on the provider other stuff related to /eth are delegated. However, I noticed that LoomProvider2 still needs to manage the listeners for the WebSocket connections, so the Web3 will use those Websocket "intefaces"

[enlight]

Please rebase this PR on master, nothing in src/mainnet-contracts should've changed in this PR