feat[fluent]: s3 builder for querying and listing files in MinIO

[charlotte-nudibranches]

Add s3 builder for querying and listing files in MinIO. Implement static method whilst waiting for STS bugfix

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Note

Adds MinIO/S3 support via a new fluent builder and necessary wiring.

• New sdk/builders/fluent/s3_builder.go: S3Builder supporting Bucket(), Key(), Get(ctx) streaming download, and List(ctx, prefix); works with static credentials or OIDC STS (AssumeRoleWithWebIdentity), path-style addressing, and endpoint HTTPS detection
• sdk/client.go: expose Client.S3() to construct the builder
• sdk/utils/types.go: extend Configuration with MinIO fields (MinIORegion, MinIOEndpoint, MinIOAccessKey, MinIOSecretKey, MinIOUseSSL, MinIOUseOIDC)
• Add AWS SDK v2 dependencies in go.mod and lock in go.sum
• usage_examples: add runS3Example and switch main to run it; comment out other fluent/search examples

^{Written by Cursor Bugbot for commit 33399b6. This will update automatically on new commits. Configure here.}

[HeloiseRigaux]

There is redundancy with these lines. I thought that maybe there ought to be a single method that manages the minioEndpoint request and the possible errors resulting from it.
minioEndpoint := getEnvOrConfig(cfg, "MINIO_ENDPOINT", "")

if minioEndpoint == "" {
return nil, fmt.Errorf("MINIO_ENDPOINT is required")
}

[mfernd]

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