feat: add Schema generator Gradle plugin

[lauzadis]

Issue \

Description of changes

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

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
6.2% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK