Implement Log Outcomes

[buenaflor]

• SDK must count each dropped log.
• SDK must calculate the size of each dropped log.
• SDK must emit both values as client outcomes.
• precise byte counting is not required; an approximate size is sufficient because:
  • Dropped logs are not billable.
  • sufficient to provide a rough overview to users (count + approximate size)
    

If the SDK already does it then close this issue

LOGS-482

[linear]

DART-272