Add JSON logger support #123
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Description
This PR adds support for JSON logging when LOG_JSON environment variable is set to true.
Related Issue
Fixes #120
Motivation and Context
In OpenHands, setting LOG_JSON=true enables JSON logging output. However, the openhands-aci logs do not support this format.
How Has This Been Tested?
Added unit tests for the JSON formatter and manually tested with LOG_JSON=true/false.
Does this PR introduce a breaking change?
No.