CMR-9840: Fixed the search-after issue for acl search and added tests…

[sxu123]

… and documentation.

Overview

What is the feature/fix?

Please summarize the feature or fix.

What is the Solution?

Pass the search-after header to the context so that it could be used by the CMR libraries.

What areas of the application does this impact?

ACL search

Checklist

• [x] I have updated/added unit and integration tests that prove my fix is effective or that my feature works
• [x] New and existing unit and int tests pass locally and remotely with my changes
• [x] I have removed unnecessary/dead code and imports in files I have changed
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings