[batch] [request]: support `linuxParameters.capabilities` on AWS Batch

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**Tell us about your request**

Add the ability to set `linuxParameters.capabilities` on AWS Batch Job Definitions. The equivalent option exists on ECS.

It's currently possible to use `inf1` instances on AWS Batch, however it's _not_ possible to set `linuxParameters.capabilities.add = ["IPC_LOCK"]`.

There's a workaround (setting `priviliged` to `true`), however this isn't ideal.

ECS documents and supports this: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs-inference.html#ecs-inference-requirements

Batch
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-batch-jobdefinition-containerproperties-linuxparameters.html

ECS
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ecs-taskdefinition-linuxparameters.html

**Which service(s) is this request for?**

AWS Batch

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**

Run inferentia workloads on AWS batch.

**Are you currently working around this issue?**

Setting `priviliged` to true

The issue concerns AWS Batch Job Definitions and the linuxParameters.capabilities field, with the linked AWS Batch and ECS CloudFormation documentation as references. Start by comparing those documented properties; done means AWS Batch can configure capabilities.add, such as IPC_LOCK, without requiring privileged mode.

Written by the indexing model from the issue text.