Add S3 ListBuckets operation

[metadaddy]

Thank you for helping out! ✨

You're welcome!

We really appreciate your commitment to improving Architect

To maintain a high standard of quality in our releases, before merging every pull request we ask that you've completed the following:

• Forked the repo and created your branch from master
• Made sure tests pass (run npm it from the repo root)
• Expanded test coverage related to your changes:
  • Added and/or updated unit tests (if appropriate)
  • Added and/or updated integration tests (if appropriate)
• Updated relevant documentation:
  • Internal to this repo (e.g. readme.md, help docs, inline docs & comments, etc.)
  • Architect docs (arc.codes)
• Summarized your changes in changelog.md
• Linked to any related issues, PRs, etc. below that may relate to, consume, or necessitate these changes

I think I've done everything I need to do:

• There do not yet seem to be any tests for S3 operations, so I didn't add anything specific to ListBuckets.
• There doesn't seem to be a changelog.md.
• I think you need a more specific checklist for aws-lite 😉

Please also be sure to completed the CLA (if you haven't already).

I don't see a CLA, but section D.6 of GitHub's terms of service fulfills the same purpose.

CLA signed!

Do let me know if there's anything I've missed 👍🏻

[CLAassistant]

All committers have signed the CLA.

[ryanblock]

@metadaddy hey, I think something weird happened in the git history, not sure what the deal is. Would you mind reopening and force pushing this once more so I can merge and release? Thanks!

[metadaddy]

For the record - everything is good - no rework required 👍🏻