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Update `ConfigurationMetadataAnnotationProcessor` to include the 'defaultValue' of a property when possible. For example the 'defaultValue' or 'server.port' is '8080'. Default values are detected by inspecting the field assignments of @ConfigurationProperties items. In order to detect field values some internals of the Java compiler are used. To save a dependency on 'tools.jar' internal javac classes are accessed using reflection. See gh-1001