Add support for new parent field as an alternative to linking

[tj-smith47]

Please consider opening a discussion in ideas category if applicable. Your feature will be prioritized on based on the number of votes.

Is your feature request related to a problem? Please describe.
I use this tool heavily in my daily workflow. I've just recently been informed some teams would rather we link tickets to epics through the new Parent field rather than linking it as blocked. I believe this may be possible with the --custom flag, but I can't find any examples of that being used.

Describe the solution you'd like
Add a --parent flag to jira issue edit

Describe alternatives you've considered
I believe this may be possible with the --custom flag, but I can't find any examples of that being used.

Additional context
This project is absolutely amazing - thank you for all of the hard work you've done to manifest and support this tool!