Change monitor scenario properties from list to map

[steven-sheehy]

Detailed description:

• Add a hedera.mirror.monitor.subscribe.rest.publishers property to target slow sampling to specific publishers
• Change hedera.mirror.monitor.publish.scenarios from a list to a map
• Change hedera.mirror.monitor.subscribe.grpc from a list to a map
• Change hedera.mirror.monitor.subscribe.rest from a list to a map
• Change monitor log and REST API elapsed duration to a prettier format (follow up of Add a monitor service & change threads property #2065 (comment))
• Fix logging stacktrace on shutdown due to conflict between Spring Boot and Log4j2's logging shutdown mechanism
• Fix monitor REST API client IP detection by relying upon standard X-Forwarded-For header, if available

Which issue(s) this PR fixes:

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@bce2fc6). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2160   +/-   ##
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  Coverage        ?   81.73%           
  Complexity      ?     2135           
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  Files           ?      412           
  Lines           ?    10987           
  Branches        ?      936           
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  Hits            ?     8980           
  Misses          ?     1695           
  Partials        ?      312           

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[sonarcloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities
0 Security Hotspots
29 Code Smells

0.0% Coverage
4.9% Duplication

[Nana-EC]

LGTM