chore: track artifact sizes

[aajtodd]

Issue #

https://github.com/awslabs/aws-sdk-kotlin/issues/416

Description of changes

• Adds a new task to gather the JVM jar sizes and write them to a JSON file in the format expected by CloudWatch.
• Adds a new task to compare the current sizes to historical data in CW
• Adds a new GH workflow to publish the results of the comparison to the PR.
  • On release the artifact sizes will be updated and new data pushed to CW

TODO

• Still need to test this in PR
• The workflow should probably fail if we are x % delta above prior averages (or whatever threshold we want to define)
• Manual workflow dispatch would be nice

Questions

• Is this the "right" way? Should we just use GetMetricData and compute average from that
• This doesn't handle any of smithy-kotlin runtime directly but it does by computing the dependency closure size of a few services.
• The dependency closure includes everything needed at runtime (stdlib, smithy-kotlin, aws-runtime + the service JAR size). Is that what we want to track?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK

[sonarqubecloud[bot]]

Quality Gate passed

Issues
1 New issue

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

MetricName	Dimensions	Bytes	DeltaPct
ArtifactSize	Artifact=aws-config-jvm.jar	1,100,080	+0.00%
ArtifactSize	Artifact=aws-core-jvm.jar	7,533	+0.00%
ArtifactSize	Artifact=aws-endpoint-jvm.jar	10,801	+0.00%
ArtifactSize	Artifact=aws-http-jvm.jar	65,781	+0.00%
ArtifactSize	Artifact=s3-jvm.jar	5,072,345	+0.00%
DependencyClosureSize	KmpTarget=jvm,Service=s3	13,279,073	+0.00%

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK

[lauzadis]

Implemented in #1290