Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-greengrassv2-3571.json

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+{
+  "category": "``greengrassv2``", 
+  "type": "api-change", 
+  "description": "[``botocore``] We have verified the APIs being released here and are ready to release"
+}

.changes/next-release/api-change-iotanalytics-4511.json

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+{
+  "category": "``iotanalytics``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Adds support for data store partitions."
+}

.changes/next-release/api-change-lookoutmetrics-82198.json

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+{
+  "category": "``lookoutmetrics``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Added \"LEARNING\" status for anomaly detector and updated description for \"Offset\" parameter in MetricSet APIs."
+}