[main] Create DefaultLayout independent of PatternLayout
#3584
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Currently,
PatternLayoutand all its patterns are a required element of Log4j Core, sinceDefaultConfigurationuses it. The default configuration is used in all Log4j Core installation as failsafe to handle logging between the time a logger context is created and the real configuration starts (a couple of ms).This PR creates a simple hardcoded layout to use with
DefaultConfiguration, based on theStatusDataformatter.(cherry picked from commit e8d5ffc)