Add additional settings fields to org API

[danimeyer]

This PR adds a number of new fields to the Organization struct that are available when getting an org via the REST API. They can be seen in the sample response in the GitHub documentation.

 "default_repository_branch": "main",

 "members_can_delete_repositories": true,
"members_can_change_repo_visibility": true,
"members_can_invite_outside_collaborators": true,
"members_can_delete_issues": false,
"display_commenter_full_name_setting_enabled": false,
"readers_can_create_discussions": true,
"members_can_create_teams": true,
"members_can_view_dependency_insights": true,

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@8fedb85). Learn more about missing BASE report.
Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3642 +/- ##
=========================================
Coverage ? 91.33% =========================================
Files ? 184 Lines ? 16174 Branches ? 0 =========================================
Hits ? 14773 Misses ? 1227 Partials ? 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, @danimeyer!
LGTM.
Merging.