feat!: output ES modules instead of CommonJS

[MantisClone]

Fixes #1148

Description of the changes

• Make all packages output ES modules instead of CommonJS modules with exceptions:
  • smart-contracts must remain a CommonJS module because Hardhat uses require() statements. smart-contracts now uses import() to dynamically import ES modules. Reference: Interoperability with CommonJS
• Add .js and /index.js file extensions for all path specifiers. Reference: Mandatory File Extensions
• Disable UMD bundling using Webpack in request-client.js, web3-signature, epk-signature, and epk-decryption.
• Update dependencies, for type information:
  • dotenv
  • ipfs-unixfs
  • axios
• Migrate from typed-emitter to tiny-typed-emitter
  • Fix error: src/ethereum-storage-ethers.ts(30,35): error TS2709: Cannot use namespace 'TypedEmitter' as a type.
• Use default imports for Keyv, Bluebird, AJV, and FormData

[MantisClone]

TODO: Consider making currency and utils packages output ES modules AND CommonJS modules.

This would decrease the code churn in the smart-contracts package. smart-contracts could consume the CommonJS variants of the currency and utils packages, but everything else could consume the ES Module variants.

TODO: Consider making all packages output ES modules AND CommonJS modules.