Add advanced presigning example

[shepazon]

This changes the "upload a file" example to include a custom configuration for one of its PutObject requests. It also removes the multi-part portion of the example, which will come back shortly as a separate example, and splits the remaining upload and download examples into two separate programs, one which uploads files with or without presigning, aand one which downloads files with or without presigning.

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[shepazon]

I'm going to move the example to a different function than GetObject.

[meyertst-aws]

So wait until it is moved before I review it?

From: Eric Shepherd @.> Reply-To: awsdocs/aws-doc-sdk-examples @.> Date: Thursday, November 14, 2024 at 11:10 AM To: awsdocs/aws-doc-sdk-examples @.> Cc: "Meyer, Steve" @.>, Review requested @.***> Subject: Re: [awsdocs/aws-doc-sdk-examples] Add advanced presigning example (PR #7065)

I'm going to move the example to a different function than GetObject.

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[shepazon]

Yeah.

[shepazon]

Ready for review, @meyertst-aws.

[shepazon]

I added a call to HeadObject in the upload function to provide an example of using a custom configuration for a presigned URL in which the customized config is actually different from one the S3Client is configured to use.

[shepazon]

This is now ready to review.