Specify vcpu and memory as resourceRequirements in AWS Batch executor

[aotimme]

When trying to use redun with AWS Batch on Fargate using the existing AWSBatchExecutor, we get the following error:

botocore.errorfactory.ClientException: An error occurred (ClientException) when calling the SubmitJob operation: vcpus is not applicable for Fargate. Use resource requirements instead.

As it turns out, it looks like specifying vcpu and memory directly on containerProperties is now deprecated (see here for vcpu and here for memory) in favor of specifying them in the resourceRequirements array, so that's the update provided here.

This update will allow running on Fargate with the AWSBatchExecutor.

[mattrasmus]

Hi @aotimme thanks for sharing this PR! We'll test it out and merge it in.

[mattrasmus]

We tested this internally and it works with existing workflows. We'll also do a follow up PR to also update the get_job_details() function to the new resources style.

Thanks again for contributing this fix!