New flags for issue edit:
- --type: set issue type by name
- --set-parent / --remove-parent: set or remove parent issue
(mutually exclusive via cmdutil.MutuallyExclusive)
- --add-sub-issue / --remove-sub-issue: manage sub-issues
- --add-blocked-by / --remove-blocked-by: manage blocked-by relationships
- --add-blocking: add blocking relationships (swaps API args)
Interactive mode: Type and Parent added to the field picker survey.
FetchOptions loads issue types when Type is selected.
Editable struct: added IssueType and Parent fields with Dirty(),
Clone(), FieldsToEditSurvey, and EditFieldsSurvey support.
GHES: relationships gated behind IssueRelationshipsSupported.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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