Anomaly Detection tutorial (#61)

* Add anomaly detection tutorial
* Update data generator to create batches at higher rate:
    * Create topics with retention
    * Increase emission rate to 1 event per second
    * Add `batchSize()` to `Data` class
    * Add `batchSize()` and quantity multiplication to `SalesData`
    * Use `batchSize()` in `DataGenerator`

Co-authored-by: Thomas Cooper <code@tomcooper.dev>

Author: piotrpdev

docs/anomaly-detection/assets/avg_range.excalidraw.svg

@@ -0,0 +1,18 @@
+apiVersion: flink.apache.org/v1beta1
+kind: FlinkDeployment
+metadata:
+  name: session-cluster-anomaly
+spec:
+  image: quay.io/streamshub/flink-sql-runner:0.2.0
+  flinkVersion: v2_0
+  flinkConfiguration:
+    taskmanager.numberOfTaskSlots: "2"
+  serviceAccount: flink
+  jobManager:
+    resource:
+      memory: "2048m"
+      cpu: 1
+  taskManager:
+    resource:
+      memory: "2048m"
+      cpu: 2