logger enhancement

[lekaf974]

Current Behavior

using current logger implementation all logs are write to os.Stdout even if it is errors which is not normal behavior.

Desired Behavior

log levels: info, trace, warn, debug should go to os.Stdout

log levels: error, fatal should go to os.Stderr

Implementation

Logger struct should have 2 handlers to handle each use case

Acceptance Tests

Add unit tests

Mockups

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