Allow configuration of SDK log mode by environment

[ianbotsf]

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Describe the Feature

Currently, the sdkLogMode config can be controlled at the service client level (and potentially soon at the shared config level via #431). This requires manual code changes, however, and may not be the most convenient in every scenario. Much like other client-level configuration, this should be manageable via environmental settings (e.g., JVM system properties or environment variables).

Is your Feature Request related to a problem?

The problem here is that changing logging levels requires a Kotlin code change, recompilation, and redeployment of build artifacts into Lambda, Elastic Beanstalk, etc. If this setting were manageable by environmental settings, a change would be much simpler and quicker.

Proposed Solution

I propose adding JVM system property and environment variable keys for detecting desired logging modes without explicit configuration in code. A stretch goal is parsing them from config profiles.

Describe alternatives you've considered

None at this time.

Additional Context

See Is your Feature Request related to a problem? above.

• [x] I may be able to implement this feature request