CodeGen reorders interface properties

[trivikr]

Describe the bug
CodeGen reorders interface properties.

Example commit https://github.com/aws/aws-sdk-js-v3/pull/1676/files#diff-fc558d17069e9da5cd0f17e2de04f4b16730dc3d5ad52fc53db2f5d27c1a90f9

SDK version number
master

Is the issue in the browser/Node.js/ReactNative?
N/A

Details of the browser/Node.js/ReactNative version
N/A

To Reproduce (observed behavior)
Examine the example commit https://github.com/aws/aws-sdk-js-v3/pull/1676/files#diff-fc558d17069e9da5cd0f17e2de04f4b16730dc3d5ad52fc53db2f5d27c1a90f9

Expected behavior
The CodeGen shouldn't reorder interface properties.

[github-actions]

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