Add Application Packages via ARM Template for Azure Marketplace

#### Feature Request Description
We're trying to use ARM templates to dynamically create Batch accounts, Pools, and Applications attached to pools; however, it doesn't look like there's a way to deploy application packages (stored in Blob storage) to the Account via an ARM template. This would be incredibly helpful

#### Describe Preferred Solution
Be able to create a new Account, Pool, and Application Packages (also attached to pools) via an ARM template.

#### Describe Alternatives Considered
N/A - for using Batch Accounts with Azure Marketplace, there aren't alternatives...Marketplace ONLY supports ARM templates.

#### Additional Context
N/A