"az batch job-schedule create" missing --environment-settings and --UserIdentity parameters

**Is your feature request related to a problem? Please describe.**
I am trying to create a Batch job schedule in a Azure Batch account with "az batch job-schedule create", then I found that I can't add environment variables and "User Identity"( the user identity under which the tasks run) to the Job Manager Task.

**Describe the solution you'd like**
Add --job-manager-task-environment-settings and --UserIdentity parameters to "az batch job-schedule create" command.

**Describe alternatives you've considered**
None. Any suggestions?

**Additional context**