fix(metrics): Rename purgeStoredMetrics() function usage in CDK example (#424)

Author: ijemmy

Diff for: examples/cdk/lib/example-function.MyFunction.ts

@@ -37,7 +37,7 @@ export const handler = async (_event: unknown, context: Context): Promise<void>
   metricWithItsOwnDimensions.addDimension('InnerDimension', 'true');
   metricWithItsOwnDimensions.addMetric('single-metric', MetricUnits.Percent, 50);
 
-  metrics.purgeStoredMetrics();
+  metrics.publishStoredMetrics();
   metrics.raiseOnEmptyMetrics();
 
   // ### Experiment tracer

Diff for: packages/metrics/tests/unit/Metrics.test.ts

@@ -511,7 +511,7 @@ describe('Class: Metrics', () => {
       await new LambdaFunction().handler(dummyEvent, dummyContext.helloworldContext, () => console.log('Lambda invoked!'));
     });
 
-    test('Purge Stored Metrics should log and clear', async () => {
+    test('Publish Stored Metrics should log and clear', async () => {
       const metrics = new Metrics({ namespace: 'test' });
       class LambdaFunction implements LambdaInterface {
         @metrics.logMetrics()