[aws-cloudwatch] GraphWidget support for different view types

[aolundin]

Analogous feature request to #9675

Currently GraphWidget only supports 'timeSeries' view. We should be able to create bar/pie charts from metrics.

Cloudformation supports (timeSeries | singleValue | bar | pie). ref: https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/CloudWatch-Dashboard-Body-Structure.html#CloudWatch-Dashboard-Properties-Metric-Widget-Object

aws-cdk/packages/@aws-cdk/aws-cloudwatch/lib/graph.ts

Line 217 in 09e994a

view: 'timeSeries',

aws-cdk/packages/@aws-cdk/aws-cloudwatch/lib/graph.ts

Line 270 in 09e994a

view: 'singleValue',

Use Case

• Being able to build cloudwatch dashboards with pie/bar widgets from metrics widgets.
• Feature parity with cloudformation

Proposed Solution

It looks like we've already got a SingleValueWidget in this library, so we probably want to implement this with that pattern and create two new classes for the missing types (bar & pie).

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

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This is a 🚀 Feature Request

[aolundin]

Should have searched for issues before creating this one... Closing as dup of #11063

[github-actions]

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