[Logging configuration] Add kwargs for structlog.processors.TimeStamper

[murzinov01]

• Added logging_timestamper_extra_params parameter in LoggingConfig with default value {"fmt": "%Y-%m-%d %H:%M:%S"} for backward compatability

Using this feature you can configure timestamper processor in your own way.
For example:
Passing this parameters

LitestarSettings(
          ...
          logging_timestamper_extra_params={"fmt": "iso", "utc": True, "key": "@timestamp"},
          ...
      )

You will see something like that (surely with service_debug=False) in your stdout:

{"event":"Scheduler has been shut down","level":"info","logger":"apscheduler.scheduler","tracing":{},"@timestamp":"2026-05-07T15:29:49.110794"}

[vrslev]

https://github.com/community-of-python/microbootstrap/releases/tag/1.3.0