first draft of custom events pipeline

dynatrace/api/openpipeline/settings/testdata/example_custom_events_pipeline.tf

@@ -0,0 +1,30 @@
+resource "dynatrace_openpipeline" "this" {
+  pipelines {
+    pipeline {
+      default_pipeline {
+        enabled      = true
+        id           = "pipeline_Custom_Event_Pipeline_8939"
+        display_name = "Custom Event Pipeline"
+        storage {
+          catchAllBucketName = "default_events"
+        }
+        processing {
+          processors {
+            processor {
+              fieldsAdd_processor {
+                enabled     = true
+                id          = "processor_Add_custom_field_8862"
+                description = "Add custom field"
+                matcher     = true
+                field {
+                  name  = "custom_field"
+                  value = "hello world"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}