Add supporting max_calls to the ray data executor

[ayushdg]

Description

This PR
Fixes #1533

• Adds support for stages to set max_calls that are propagated if it's a task based stage (not actor based).
• Exposes it for the iterate extract stage so that we can override it for justext extraction. Currently exposed as a constructor arg but open to cleaner ideas. Discussed a bit in Explore making stage_spec overridable during stage creation #1532.
• Adds tests including some tests that ensure tasks with max_calls are not fused with other tasks and lose this information.

Usage

# Add snippet demonstrating usage

Checklist

• I am familiar with the Contributing Guide.
• New or Existing tests cover these changes.
• [N/A ] The documentation is up to date with these changes.

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[ayushdg]

/ok to test d7cf34d

[sarahyurick]

LGTM!