feat: add client config for userAgentAppId

[siddsriv]

Issue

Internal JS-5173

Description

Adds a client config field for userAgentAppId

Testing

Unit tests:

• util-user-agent-browser

Location: /local/home/sidddsri/workspace/aws-sdk-js-v3/packages/util-user-agent-browser
.
 PASS  src/index.native.spec.ts
 PASS  src/index.spec.ts

Test Suites: 2 passed, 2 total
Tests:       5 passed, 5 total
Snapshots:   0 total
Time:        4.485 s

• middleware-user-agent

 PASS  src/user-agent-middleware.spec.ts
  userAgentMiddleware
    ✓ should include appId in user agent when provided (1 ms)
    ✓ should include long appId in user agent when provided (1 ms)

• Client config option is generated:

.
.
/**
   * The AWS region to which this client will send requests
   */
  region?: string | __Provider<string>;

  /**
   * The application ID used to identify the application.
   */
  userAgentAppId?: string | __Provider<string>;
.
.

.
.
    useFipsEndpoint: config?.useFipsEndpoint ?? loadNodeConfig(NODE_USE_FIPS_ENDPOINT_CONFIG_OPTIONS),
    userAgentAppId: config?.userAgentAppId ?? loadNodeConfig(NODE_APP_ID_CONFIG_OPTIONS),
.
.

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.