Large files can throw YAMLException due to node limits

[mkluzacek]

Is your feature request related to a problem? Please describe.
Same problem as mentioned in spring-projects/spring-boot#23096. When loading large yaml config from consul it ends up wtih org.yaml.snakeyaml.error.YAMLException: Number of aliases for non-scalar nodes exceeds the specified max=50.

This was fixed for org.springframework.boot.env.OriginTrackedYamlLoader but is still problem in org.springframework.beans.factory.config.YamlPropertiesFactoryBean that is used by org.springframework.cloud.consul.config.ConsulPropertySource

Describe the solution you'd like
Provide a way to override the settings in org.yaml.snakeyaml.LoaderOptions or use custom org.springframework.beans.factory.config.YamlProcessor in org.springframework.cloud.consul.config.ConsulPropertySource.