chore(codegen): use Record type instead of Object

[trivikr]

Issue

Internal JS-3299

Description

Use Record type in place of Object in aws-typescript-codegen

Testing

TypeScript playground:

const exampleObj = { "one": 1, "two": 2, "three": 3}

const record: Record<string, number> = exampleObj;
const keyStringObj: {[key:string]: number} = exampleObj;

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[github-actions]

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