Add sample for making a batch request

[JesseLovelace]

Adds a sample for making a batch request, internal bug 121151093

[snippet-bot[bot]]

Here is the summary of changes.

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• google-cloud-examples/src/main/java/com/google/cloud/examples/storage/objects/BatchSetObjectMetadata.java:3, tag storage_batch_request

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[danielduhh]

@frankyn this good to merge?

[cbonnie]

Thanks for your work, Jesse!