Enable all kinds of env variables in query-service

[grandwizard28]

Description

Users may wish to configure env of query-service in multiple ways. Instead of treating each requirement separately, we should provide a configuration like the following:

additionalEnvs:
  env_from_secret:
    valueFrom:
      secretKeyRef:
        key: secret-1
        name: key-1
  env_from_configmap:
    valueFrom:
       configMapKeyRef:
          name: configmap-1
          key: key-1
   env_value: custom-value

This will give users the flexibility to manage env variables as they wish.