chore(clients): use Record type in event stream deserializer

[trivikr]

Issue

Internal JS-3299

Description

Use Record<string, any> in event stream deserializer

Testing

TypeScript playground:

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

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

Additional Context

smithy-ts PR: smithy-lang/smithy-typescript#556

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