feat(AdminAPI): Adding the notifications feature introduced Q4 2021

[tyao117]

PR summary

Including some features to the admin openapi into the sdk

PR Checklist

Please make sure that your PR fulfills the following requirements:

• [ ] The commit message follows the Angular Commit Message Guidelines.
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Current vs new behavior

Does this PR introduce a breaking change?

• [ ] Yes
• [ ] No

Other information

[gary1998]

Addressed in this PR https://github.com/IBM/scc-go-sdk/issues/55

[sccdeveloper]

:tada: This PR is included in version 3.1.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: