Extend support for SQL and PPL (Piped Processing Language) plugins

The following extensions are required

• user should be able to configure Eliatra Suite so that index .ql-datasources is treated as system protected index
• The list of available permissions in UI should be extended with
  • cluster:admin/opensearch/ql/datasources/create
  • cluster:admin/opensearch/ql/datasources/read
  • cluster:admin/opensearch/ql/datasources/update
  • cluster:admin/opensearch/ql/datasources/delete
  • cluster:admin/opensearch/ppl