r/aws_cloudwatch_metric_alarm: Add period attribute to metric_query in order to support Metrics Insights Alarms

[henkka]

Description

Adds period attribute to metric_query in order to support AWS CloudWatch Metrics Insights Alarms.

Closes #28617

References

• https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricAlarm.html#API_PutMetricAlarm_Examples
• https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch-metrics-insights-alarms.html

Output from Acceptance Testing

$ make testacc TESTS=TestAccCloudWatchMetricAlarm_expression PKG=cloudwatch
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/cloudwatch/... -v -count 1 -parallel 20 -run='TestAccCloudWatchMetricAlarm_expression'  -timeout 180m
=== RUN   TestAccCloudWatchMetricAlarm_expression
=== PAUSE TestAccCloudWatchMetricAlarm_expression
=== CONT  TestAccCloudWatchMetricAlarm_expression
--- PASS: TestAccCloudWatchMetricAlarm_expression (93.18s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/cloudwatch 93.295s

[github-actions]

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[github-actions]

Welcome @henkka 👋

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[github-actions]

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