Support more sources for user agent's app ID

[ianbotsf]

Describe the feature

The User Agent metadata currently sources an app ID from an environment variable or system property. In addition to these two sources, users must also be able to set the app ID explicitly via client configuration or via a profile key. The precedence order should be:

1. client configuration (highest)
2. aws.userAgentAppId system property
3. AWS_SDK_UA_APP_ID environment variable
4. sdk_ua_app_id profile key (lowest)

Is your Feature Request related to a problem?

It would be great if users had more options to configure their app IDs.

Proposed Solution

No response

Describe alternative solutions or features you've considered

No response

Acknowledge

• I may be able to implement this feature request

AWS Kotlin SDK version used

0.27.0-beta

Platform (JVM/JS/Native)

OpenJDK 1.8

Operating System and version

Amazon Linux 2

[github-actions]

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