Split the build into two: one for CommonJS modules and one for ESM

[mmv08]

Context / issue

If you use NodeJS and ESModules, the library imports do not work as expected, you can see an example in this issue:
https://ethereum.stackexchange.com/questions/133776/error-in-deploying-a-safe-methods-is-empty

It means that for ESM you have to do this:

import SafeCoreSDK from '@gnosis.pm/safe-core-sdk'

console.log(SafeCoreSDK)
// {
//  default: SafeCoreSDK
// }
const SDK = SafeCoreSDK.default

Proposed solution

Separate builds for esm and commonjs like other libraries do. An example - https://github.com/gnosis/evm-proxy-detection

Alternatives

Can't see any

Additional context

• Node.JS documentation about ESM interoperability with CommonJS

[mmv08]

I've also just discovered that this completely breaks types with typescript

[dasanra]

Example on how to do this based on safe-apps-sdk safe-global/safe-apps-sdk#512

[dasanra]

Almost done in PR #1049 . We will be using #514 as the main ticket.