Batch: Add Support for Options Bags and Certificates to Dataplane SDK

[skapur12]

Description

This PR is to add support in the Java SDK for the officially generated options bag (basically a grouping of optional parameters instead of having them in a flat list). This allows us to add more optional parameters in the future without it being a breaking change, and prevents the customer from having to pass in null many times.
For example, instead of this:
void deleteTaskFile(String jobId, String taskId, String filePath, Integer timeOutInSeconds, Boolean recursive)
We now have this:
public void deleteTaskFile(String jobId, String taskId, String filePath, DeleteBatchTaskFileOptions options)
Only the optional parameters are grouped, not the required ones.

We are also adding support for certificates back into the Java SDK (we were told to remove it a few months ago as the Batch service was set to deprecate it, but due to some delays been deprecated yet, so we are adding it back in).

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

com.azure:azure-compute-batch

[wiboris]

It would have been good to have some certificate tests