Many `try_compile` and `try_run` calls occur inside check modules
between `message(CHECK_START)` and `message(CHECK_{PASS,FAIL})` pairs.
Add a field to configure log entries to report this context.
Issue: #23200
In order to support multiple log versions without buffering the
entire log, move versioning to the level of individual events.
Multiple versions of an event may then be logged consecutively.
Issue: #23200
Add infrastructure for a "configure log". Use YAML for a balance of
machine- and human-readability to records details of configure-time
events in a structured format.
Teach the RunCMake test framework to support matching the configure log.
Issue: #23200
