Support for Stardust protocol according to the Tangle Improvement Proposals

This release improves the ESM packaging and more specifically the polyfill for 3rd part module loading.

Bump version due to npm publish issue https://status.npmjs.org/incidents/wy4002vc8ryc

• Separates crypto and utils into separate packages, this is a breaking change as some imports will need to change to point to the correct package.
  • Utility classes like Converter, RandomHelper will need their imports changing from @iota/iota.js to @iota/util.js
  • Crypto classes like Blake2b, Bech32 will need their imports changing from @iota/iota.js to @iota/crypto.js

• Update all BigInt calculations to use big-integer lib instead of native, so that when polyfill is used e.g. in React Native the calculations work
• Update IPowProvider interface so that BigInteger nonce is returned as string

• Breaking Change - MQTT has moved to its own package @iota/mqtt.js
• Improve ESM Modules format
• ESM distribution is located in dist/esm directory
• Renamed dist/iota.js to dist/cjs/index-node.js
• Renamed dist/iota.browser.js to dist/cjs/index-browser.js
• Improve platform detection for RandomHelper

• PoW optimizations

A New Dawn

First release for the new IOTA Chrysalis network.

Important Changes:

• tips parameter is no longer needed for getInclusionState api call
• getLatestInclusion api call has been removed
• No threshold parameter is required in getBalances api call
• getTips api call has been removed

Changelog

• Fix: Ignore null trytes during trytes to ascii conversion (#480)
• Update: Remove threshold parameter from getBalances() (#481)
• Update: Remove getTips() api (#483)
• Update: Remove tips parameter from getInclusionStates() (#484)
• Update: Remove getLatestInclusion (#484)
• Chore: Update crypto-js in @iota/core (#460)
• Chore: Update build scripts for @iota/pearl-diver-react-native (#501, #502)