text: Title: Add public API to query is Robot running and is dry-run active
  Body: For libraries it would be helpful to know if RF is running, or if a library is just imported as python package or by libdoc, which also would be the case when language servers would analyze them.
  
  https://robotframework.slack.com/archives/C0K0240NL/p1677318363986369
  
  Proposal would be two boolean properties either in BuiltIn or robot.api?!
  
  `robot_running` or `robot_is_running` would be True if there is an execution context.
  `dry_run_active` or `dryrun_is_active` would be True if there is a running context and the dryrun is ongoing.
  
  