r2: add examples for downloading files using API tokens

[elithrar]

This PR adds examples on how to authenticate against the R2 API using auth tokens in JavaScript (Node.js), Go, and Python 3.

cc @harshil1712

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Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/api/s3/tokens/	https://silverlock-r2-auth-examples.cloudflare-docs-7ou.pages.dev/r2/api/s3/tokens/

[harshil1712]

@elithrar, we already have examples for Pre-signed URL in our docs.

JS -> https://developers.cloudflare.com/r2/examples/aws/aws-sdk-js-v3/ Go -> https://developers.cloudflare.com/r2/examples/aws/aws-sdk-go/ Python -> https://developers.cloudflare.com/r2/examples/aws/boto3/

I thought you were asking about code examples on creating the tokens via the API.

[elithrar]

These aren't for pre-signed URLs. They are for direct token access.

What parts have you believing otherwise?

[harshil1712]

Ah, my bad. The first part of the pre-signed URL examples are the same as the one in this PR. The only difference I could figure out was the hashed Secret Access Key. I didn't know this was a possibility.

[elithrar]

@dcpena @harshil1712 - can one of you update this for the new docs engine? This didn't get merged before the migration.

[dcpena]

Closing in favor of https://github.com/cloudflare/cloudflare-docs/pull/16488 which recreates this PR post docs migration.