Reduce bundle size by replacing dependencies that have "one util use" or "drop in replacements"

[dillchen]

• Easy Wins: moment > day, lodash (removal), and jquery > axios (saves 1.5mb uncompressed)
• Easy win Remove import BigNumber from 'bignumber.js'; (and replace with bn.js) (one file)
• Easy win Remove undescore
• Easy Win remove ethereumjs-util

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Semi Easy

• investigate if bn.js dependencies can be better resolved (300kb of savings)

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• investigate implying ethereum package use ethers / ethereumj-util / web3-core / web3-utils => we may or may not be using all requisite functions => please note down if it's a feasible before or after the react conversion and any larger front end state refactor (end of Q1)

[dillchen]

import { Address } from 'ethereumjs-util'; in the cosmos_evm_metamask_web_wallet is our only use of ethereumjs-util on the client side.

https://github.com/hicommonwealth/commonwealth/blob/5d6051d96224e7897bdf6114935f53ac1acbe72f/packages/commonwealth/client/scripts/controllers/app/webWallets/cosmos_evm_metamask_web_wallet.ts

This adds (potentially 338kbs) gzipped => with half of it being loaded in chunk 7631 (eagerly loaded), however lot of is from the included magic-sdk packages?