Investigate ways to paginate projects and comments in Jira

Jira API docs: https://docs.atlassian.com/software/jira/docs/api/REST/7.6.1/#api/2/issue-getComments

Jira API docs show that comments can be paginated. However, unlike issues, the jira-ruby gem doesn't support pagination of comments or projects.

This issue is a spike to investigate how best to implement pagination or at least to batch requests for projects and comments.

Implementation is not a requirement of &2766 (closed) but should be completed in &2826. This issue is just for investigation.