As a user, I can query Test Runs based on their attributes using JQL functions

As a user, I can query Test Runs based on their attributes using JQL functions.

Examples:

• obtain related Tests based on the Test Run's...
  • executed by
  • assigned by
  • having or not having (step/global) comments(substring of comments)
  • having or not having associated defects ("open"/"closed")
  • status(es) of test run
  • started/finished dates