Better format statistics logging

It seems we have 8 spaces indentation at the beginning:

[crawlee.statistics.statistics] INFO  crawlee.beautifulsoup_crawler.beautifulsoup_crawler request statistics {
        "requests_finished": 0,
        "requests_failed": 0,
        "retry_histogram": [
          0
        ],
        "request_avg_failed_duration": null,
        "request_avg_finished_duration": null,
        "requests_finished_per_minute": 0,
        "requests_failed_per_minute": 0,
        "request_total_duration": 0.0,
        "requests_total": 0,
        "crawler_runtime": 0.007741
      }
[crawlee.beautifulsoup_crawler.beautifulsoup_crawler] INFO  Final request statistics: {
        "requests_finished": 32,
        "requests_failed": 0,
        "retry_histogram": [
          32
        ],
        "request_avg_failed_duration": null,
        "request_avg_finished_duration": 0.349596,
        "requests_finished_per_minute": 320,
        "requests_failed_per_minute": 0,
        "request_total_duration": 11.187069,
        "requests_total": 32,
        "crawler_runtime": 6.007066
      }