Add Explicit fields for config entries in values.yaml

[mwestphall]

• Adds a values.yaml entry for every field previously controlled by the processor.config multiline string
• Split roughly as follows:
  • Prometheus server url and auth: processor.prometheus
  • Values that control query mode and interval: processor.query
  • Fields that are only used in summary-level APEL values (benchmark, processors, nodes): ssmsend.config
  • Everything else: processor.config

The helm chart currently falls back to the previous multiline string handling behavior if processor.config is a string instead of an object, which should hopefully make migration easier.