Introduce Testkit backend logging level support #1519
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This update introduces support for setting logging levels in Testkit backend. The selected level and the logging is shared by both the backend and the drivers created by the backend.
The backend itself logs exchanges with the Testkit.
Example:
```
2023-04-06T13:20:14.769459 FINE neo4j.org.testkit.backend.channel.handler.TestkitRequestResponseMapperHandler - Inbound Testkit message '{"name": "NewSession", "data": {"driverId": "0", "accessMode": null, "bookmarks": null, "database": null, "fetchSize": null, "impersonatedUser": null, "notificationsMinSeverity": "WARNING"}}'
2023-04-06T13:20:14.781204 FINE neo4j.org.testkit.backend.channel.handler.TestkitRequestResponseMapperHandler - Outbound Testkit message '{"name":"Session","data":{"id":"1"}}'
```
The level is selected by setting a `TESTKIT_BACKEND_LOGGING_LEVEL` environment variable to one of the values supported by the `java.util.logging.Level.parse(String)`. The absence of the value or an empty string turns the logging off.
This feature is meant for debugging purposes only.
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Cherry-pick: #1406
This update introduces support for setting logging levels in Testkit backend. The selected level and the logging is shared by both the backend and the drivers created by the backend.
The backend itself logs exchanges with the Testkit.
Example:
The level is selected by setting a
TESTKIT_BACKEND_LOGGING_LEVELenvironment variable to one of the values supported by thejava.util.logging.Level.parse(String). The absence of the value or an empty string turns the logging off.This feature is meant for debugging purposes only.