[ARROW-16960] [R] Implement a print() method for the ExecPlan R6 class

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 8.0.0
• Component/s: R
• External issue URL: https://github.com/apache/arrow/issues/32278
• Assignee: Dragoș Moldovan-Grünfeld
• Reporter: Dragoș Moldovan-Grünfeld
• Created: 01/Jul/22 15:10
• Updated: 11/Jan/23 11:47
• Resolved: 04/Jul/22 18:30