New rule: comment added within X hours of worklog

[dspasojevic]

Our current comment checking rule requires a comment if:

1. time has been logged AND the issue isn't closed
2. OR the issue is in progress

A conceptually simpler rule is to require a comment whenever time has been logged. i.e a comment must be added "around" the same time that a worklog is added.

The check would look at:

1. time of most recent worklog
2. time of most recent comment

the rule would pass if the comment was <1d before the worklog or after it.

What makes it non-trivial is that worklogs and comments are both paginated fields, so they may be truncated. Issues are currently retrieved using the search API. We need to do one of:

1. see if those fields can be sorted so that we always get the most recent comment and worklog
2. check search results and (if necessary) pull individual ticket comments and worklogs