chore(clients): allow commands to be constructed without arg if optional

[trivikr]

Issue

• Codegen for feat: allow commands to be constructed without arg if all arg fields optional smithy-lang/smithy-typescript#1206
• Fixes: Make Command input object optional -- ELBv2: Cannot read properties of undefined (read 'LoadBalancerArns') #4579

Description

Allow commands to be constructed without arg if optional

Testing

$ yarn tsc --version
Version 5.4.2

Before

$ cat test.ts
import { STS } from "@aws-sdk/client-sts";
const client = new STS();
client.getCallerIdentity().then(console.log);

$ yarn tsc test.ts
test.ts:3:8 - error TS2554: Expected 1-3 arguments, but got 0.

3 client.getCallerIdentity().then(console.log);
         ~~~~~~~~~~~~~~~~~

  node_modules/@aws-sdk/client-sts/dist-types/STS.d.ts:45:23
    45     getCallerIdentity(args: GetCallerIdentityCommandInput, options?: __HttpHandlerOptions): Promise<GetCallerIdentityCommandOutput>;
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    An argument for 'args' was not provided.


Found 1 error in test.ts:3

After

$ cat test.ts
import { STS } from "../aws-sdk-js-v3/clients/client-sts";
const client = new STS();
client.getCallerIdentity().then(console.log);

$ yarn tsc test.ts

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