feat: Add support for sub-issue

[e7217]

Hello,
I have added some features to support Sub-issue.

The following features have been added:

• Add sub-issue
• Remove sub-issue
• Get sub-issue list by issue
• Reprioritize sub-issue

Sorry for the delay in developing this feature.
Thank you for your review😀

Fixes#3546
cc@gmlewis

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (304d3d0) to head (fde3e4b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3580 +/- ##
==========================================
+ Coverage 91.29% 91.32% +0.03% 
==========================================
Files 183 184 +1 Lines 16087 16143 +56 ==========================================
+ Hits 14686 14742 +56 
Misses 1227 1227 Partials 174 174 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[gmlewis]

Thank you, @e7217! Please follow the instructions in step 4 of CONTRIBUTING.md and push the changes to this PR.

[gmlewis]

Thank you, @e7217!
This was a quick review because that's all I currently have time for, but should help move this PR in the right direction.

[e7217]

Thank you, @e7217! This was a quick review because that's all I currently have time for, but should help move this PR in the right direction.

@gmlewis I appreciate your review. It has been helpful to me.

[gmlewis]

Thank you, @e7217!
Just a few more tweaks, and a few comments that were not addressed previously, please... then we should be ready for a second LGTM+Approval from any other contributor to this repo before merging.

[e7217]

@gmlewis
Oh, it was my mistake. I'm sorry for the inconvenience. Despite that, thank you for your detailed review. I have made a commit that includes your checking points and updated the test cases.

[gmlewis]

Looking at the documentation for these endpoints, I'm not seeing any need to add the mediaTypeV3 header, so all these lines can safely be removed, I believe. Feel free to correct me if I've missed them.

[e7217]

Looking at the documentation for these endpoints, I'm not seeing any need to add the mediaTypeV3 header, so all these lines can safely be removed, I believe. Feel free to correct me if I've missed them.

The header values are included as shown below, and I used the predefined header values from go-github. Since the response was coming back correctly, I applied them as is. If you think it would be better to remove this, I will delete that part. Please let me know your opinion.

@gmlewis

[gmlewis]

Right, but the one you added doesn't match.

You added application/vnd.github.v3+json, so I think this one can be removed.

[e7217]

@gmlewis ok, I have removed it. Thank you!

[gmlewis]

Thank you, @e7217!
LGTM.

Awaiting second LGTM+Approval from any other contributor to this repo before merging.

@stevehipwell - might you have time for a code review? Thank you!

[DiegoDev2]

LGTM! @e7217@gmlewis

[gmlewis]

Thank you, @DiegoDev2!
Merging.