Allow mounting be-log fe-log volume to side car container

[dengliu]

Describe the problem

Some logs like fe.internal.log fe.gc.log.20240605-094644 are not print to stdout even when LOG_CONSOLE=1 is set.
One way to get it to datadog is to tail it from a sidecar container and leverage datadog agent to upload it to DD backend

Describe the solution you'd like

Have an option in the helm values.yaml file to allow mounting log volume to sidecar

Additional context

Add any other context or screenshots about the enhancement here.

[yandongxiao]

The sidecar is fully open, allowing users to attach any volume to the sidecar themselves.
In helm values.yaml, you can check how log volume name is named.

    - name: {{ .Values.starrocksFESpec.storageSpec.name }}{{ template "starrockscluster.fe.log.suffix" . }}