Improve server logging in json format

[agbpatro]

Description

Fleet telemetry has a config to set server logging in json mode here. However the logs aren't in json format. This PR formats all logs in json format if flag is set

before

time="2024-04-02T18:51:12Z" level=info msg=starting
time="2024-04-02T18:51:12Z" level=info msg=status_server_configured
time="2024-04-02T18:51:12Z" level=info msg=profiler_started
time="2024-04-02T18:51:12Z" level=info msg="registered kafka for namespace: tesla_telemetry"
time="2024-04-02T18:51:12Z" level=info msg="registered pubsub for project: test-project-id, namespace: tesla_telemetry"
time="2024-04-02T18:51:12Z" level=info msg="appending custom CA file :/etc/tesla/certs/server/vehicle_device.CA.cert"

now

{"activity":true,"context":"fleet-telemetry","level":"info","msg":"starting_server","time":"2024-04-02T18:47:00Z"}
{"activity":true,"context":"fleet-telemetry","level":"info","msg":"status_server_configured","time":"2024-04-02T18:47:00Z"}
{"activity":true,"context":"fleet-telemetry","level":"info","msg":"profiler_started","port":4269,"time":"2024-04-02T18:47:00Z"}
{"activity":true,"context":"fleet-telemetry","level":"info","msg":"kafka_registered","namespace":"tesla_telemetry","time":"2024-04-02T18:47:00Z"}
{"activity":true,"context":"fleet-telemetry","level":"info","msg":"pubsub_registerd","namespace":"tesla_telemetry","project":"test-project-id","time":"2024-04-02T18:47:00Z"}
{"activity":true,"ca_file_path":"/etc/tesla/certs/server/vehicle_device.CA.cert","context":"fleet-telemetry","level":"info","msg":"custom_ca_file_appened","time":"2024-04-02T18:47:00Z"}

Fixes # (issue)

Type of change

Please select all options that apply to this change:

• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Documentation update

Checklist:

Confirm you have completed the following steps:

• [X] My code follows the style of this project.
• [X] I have performed a self-review of my code.
• [ ] I have made corresponding updates to the documentation.
• [X] I have added/updated unit tests to cover my changes.
• [ ] I have added/updated integration tests to cover my changes.