Security plugin configuration

[siegfriedweber]

Part of #1

Tasks

• Decision: Configure the OpenSearch security plugin #51
• feat: Allow the configuration of the security plugin #117
• Configure the OpenSearch security in the cluster spec demos#370

[siegfriedweber]

Release Notes

New platform features

OpenSearch

The OpenSearch security plugin is now configurable within the OpenSearchCluster specification. Users can choose for each configuration file whether to initialize it solely with the provided values and manage it through the API or to allow the operator to take over management.
It is essential to remove both podOverrides and configOverrides related to security settings, such as plugins.security.allow_default_init_securityindex.