Enable more customization in the clickhouse operator

[grandwizard28]

Description

The clickhouse operator chart is not customizable. We should move all configs from hardcoded configmaps into values.yaml so that values can be overridden if needed. For example we can do something like:

...
configs:
  confdFiles: null
  configdFiles:
    01-clickhouse-01-listen.xml: |
      <yandex>
          <!-- Listen wildcard address to allow accepting connections from other containers and host network. -->
          <listen_host>::</listen_host>
          <listen_host>0.0.0.0</listen_host>
          <listen_try>1</listen_try>
      </yandex>
...

This will help prevent changes such as #574.