chore(deps): replace deprecated lib to alternative

[yamatatsu]

Description of your changes

This PR remove deprecated library @aws-sdk/util-base64-node replacing to @smithy/util-base64 that is official alternative library.
See, https://www.npmjs.com/package/@aws-sdk/util-base64-node.

Related issues, RFCs

Issue number: #2246

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[dreamorosi]

Hi, thank you for taking the time to open this PR.

As I mentioned in the linked issue, we would like to go in a different direction and instead adopt the fromBase64 utility that we recently added to the commons package.

If you'd like to continue working on this and see the PR merged I'd kindly ask you to make changes in that regard and remove the @smithy dependency.

Apologies if this might cause you some rework, to avoid this type of occurrence in the future I'd advise to wait for a feedback from a maintainer in the issue before opening the PR, that way we'll be aligned from the beginning and we have a better chance to merge the PR with minor adjustments or as is.

[dreamorosi]

Hi @yamatatsu, are you still interested in continuing this PR?

If not there's no problem at all and we'll take on the task at some point in the near future.

Please let me know, or we'll close the PR in a week.

[yamatatsu]

@dreamorosi
Thank you for feedback. And so sorry for late response. 🙇🏻
I've addressed your comments.
In my thinking, we can depend on @smithy/xxx only as devDependencies. Or we should implement toBase64() like as fromBase64()? WDYT? 🤔

[dreamorosi]

Hi @yamatatsu, no problem and thanks for coming back to this.

I agree with you, we can depend on it as a devDependency for now since we use toBase64() only in the tests.

Thanks!

[dreamorosi]

I have left one comment to fix the implementation and make the tests passing, once that's addressed we can merge this!

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
3.9% Duplication on New Code

See analysis details on SonarCloud

[dreamorosi]

Thanks a lot for working on this PR and following through with all the feedback!

Congrats 🎉