Add default roles for sql plugin (opensearch-project#2729)

Signed-off-by: Sean Kao <seankao@amazon.com>
Signed-off-by: Sam <samuel.costa@eliatra.com>

config/roles.yml

@@ -136,6 +136,19 @@ observability_full_access:
     - 'cluster:admin/opensearch/observability/delete'
     - 'cluster:admin/opensearch/observability/get'
 
+# Allows users to all PPL functionality
+ppl_full_access:
+  reserved: true
+  cluster_permissions:
+    - 'cluster:admin/opensearch/ppl'
+  index_permissions:
+    - index_patterns:
+        - '*'
+      allowed_actions:
+        - 'indices:admin/mappings/get'
+        - 'indices:data/read/search*'
+        - 'indices:monitor/settings/get'
+
 # Allows users to read and download Reports
 reports_instances_read_access:
   reserved: true
@@ -228,6 +241,16 @@ cross_cluster_replication_follower_full_access:
         - "indices:admin/plugins/replication/index/update"
         - "indices:admin/plugins/replication/index/status_check"
 
+# Allows users to use all cross cluster search functionality at remote cluster
+cross_cluster_search_remote_full_access:
+  reserved: true
+  index_permissions:
+    - index_patterns:
+        - '*'
+      allowed_actions:
+        - 'indices:admin/shards/search_shards'
+        - 'indices:data/read/search'
+
 # Allow users to read ML stats/models/tasks
 ml_read_access:
   reserved: true