feat(investor-foxy): switch from web3 to ethers and JsonRpcBatchProvider

[gomesalexandre]

Description

This switches the current investor-foxy API implementation from web3.js to ethers.js, to be able to use JsonRpcBatchProvider.

web3.js also provides a BatchRequest API, unfortunately after spending more than a day on it, it seems like that API is rugged currently and isn't compatible with our programmatic calls with blockNumber specified.

• [x] Base migration from web3.js to ethers - compiles
• [x] Regression test that values are correct
• [ ] ~~Batch promises together so the underlying JSON RPC calls are automagically batched by JsonRpcBatchProvider~~ This will better live in a follow-up PR. Let's get the switch to ethers.js merged first, and then we can improve the business logic

Issue

N/A

Risks

Everything FOXy could be borked - test locally against latest @shapeshiftoss/investor-foxy.

[gomesalexandre]

Current dependencies on/for this PR:

• main
  • PR #1032 👈
    • PR #1131
      • PR #1130

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[gomesalexandre]

Opening for early review, added self-review comments