common Add encode, decode and uuid helpers

[mtuchi]

Summary

Add encode, decode and uuid helper function and wrote unit test for each function. For now these functions are exported in http adaptor only as util functions. [util.encode, util.decode, util.uuid]

Fixes
This will make it easy creating a base64 encoded payload that is needed when working with GitHub Rest API

Details

• I have used Buffer for base64 encoding and decoding mainly because from a quick online read Buffer is more performant especially when it comes to huge data volume. Also Buffer supports string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object
• For uuid i am using randomUUID from node:crypto without modifying the default option disableEntropyCache which caches enough random data to generate up to 128 random UUIDS

AI Usage

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• Code generation (copilot but not intellisense)
• Learning or fact checking
• Strategy / design
• Optimisation / refactoring
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• Other
• I have not used AI

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Review Checklist

Before merging, the reviewer should check the following items:

• Does the PR do what it claims to do?
• If this is a new adaptor, added the adaptor on marketing website ?
• Are there any unit tests?
• Is there a changeset associated with this PR? Should there be? Note that
  dev only changes don't need a changeset.
• Have you ticked a box under AI Usage?

[josephjclark]

Lovely!

Please bump versions and expose the functions in whichever adaptor you need this for