add securityContext for o11y.prometheus

[OnlyPiglet]

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alibaba/higress#727

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add new field for o11y.prometheus to set securityContext for prometheus

o11y:
  prometheus:
    securityContext:
      enabled: true
      runAsUser: 0
      fsGroup: 0

Other related information

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[OnlyPiglet]

changed for more flex , thanks @CH3CHO

o11y:
  prometheus:
    securityContext: {}

      securityContext:
        {{- toYaml .Values.o11y.prometheus.securityContext | nindent 8 }}