Evaluate providing ESM artifact for Node.js once TypeScript provides stable support

[trivikr]

Is your feature request related to a problem? Please describe.

The AWS SDK for JavaScript (v3) currently does not provide a separate ESM artifact for Node.js
Users either use the CJS artifact or ES5 artifact.

Describe the solution you'd like

TypeScript 4.5 added Experimental Nightly-Only ECMAScript Module Support in Node.js.
The existing issues are being discussed here, and official documentation can be viewed here.

Provide ESM artifacts once TypeScript support gets stable.

Describe alternatives you've considered

Not providing ESM artifacts for AWS SDK for JavaScript (v3) packages.

Additional context

TypeScript version needs to be bumped to 4.6 with named export support before picking this up. Details in #3217

[trivikr]

TypeScript 4.7 Beta added ECMAScript Module Support in Node.js
https://devblogs.microsoft.com/typescript/announcing-typescript-4-7-beta/#esm-nodejs

The TypeScript 4.7 Final will be released in late-May 2022.

[trivikr]

As per Node.js docs, we can also use an ESM Wrapper instead of emitting ESM artifacts.

[trivikr]

Revisiting after merging Node.js and browser utilities in util-base64

• clients chore(clients): import fromBase64 and toBase64 from util-base64 #4140
• packages chore(packages): replace util-base64-* with util-base64 #4141

As we use @tsconfig/node14 as base for clients, we can do the same for packages and follow-up experimenting with export maps with dist-es/index.js for ESM support.

[kuhe]

related: #3622

[github-actions]

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