feat(middleware-user-agent): add client config for userAgentAppId

[siddsriv]

Issue

Internal JS-5173

Description

Adds a client config field for userAgentAppId

Testing

Unit tests:

• util-user-agent-node

 PASS  src/defaultUserAgent.spec.ts
  createDefaultUserAgentProvider
    ✓ should return basic node default user agent (5 ms)
    ✓ should set crt available key if aws-crt is available in runtime (1 ms)
    ✓ should skip api version if service id is not supplied (1 ms)
    ✓ should add AWS_EXECUTION_ENV (2 ms)
    ✓ should add app id if available (2 ms)

Test Suites: 1 passed, 1 total
Tests:       5 passed, 5 total
Snapshots:   0 total
Time:        2.86 s
Ran all test suites.
Done in 3.44s.

• 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 in runtimeConfig.ts:

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

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[trivikr]

Since defaultUserAgent is deprecated, the call on line 33 should be changed to createDefaultUserAgentProvider.

[siddsriv]

will do that codegen change to clients in a separate PR