fix: Improve crawler statistics logging

[vdusek]

Description

• Increase statistics log table width (so that the default maximum number of retries fits there).
• Add format_duration util function for human-readable duration values in stats.

Issues

• Closes: Improve crawler stats logging #1317

Demonstration

import asyncio

from crawlee.crawlers import ParselCrawler, ParselCrawlingContext
from crawlee.errors import SessionError


async def main() -> None:
    crawler = ParselCrawler(statistics_log_format='table')

    @crawler.router.default_handler
    async def request_handler(_: ParselCrawlingContext) -> None:
        raise SessionError('Blah blah blah')

    await crawler.run(['https://crawlee.dev'])


if __name__ == '__main__':
    asyncio.run(main())

Log:

$ python run_crawler.py 
[ParselCrawler] INFO  Crawled 0/8292 pages, 0 failed requests, desired concurrency 1.
[ParselCrawler] INFO  Current request statistics:
┌───────────────────────────────┬────────┐
│ requests_finished             │ 0      │
│ requests_failed               │ 0      │
│ retry_histogram               │ [0]    │
│ request_avg_failed_duration   │ None   │
│ request_avg_finished_duration │ None   │
│ requests_finished_per_minute  │ 0      │
│ requests_failed_per_minute    │ 0      │
│ request_total_duration        │ 0s     │
│ requests_total                │ 0      │
│ crawler_runtime               │ 14.1ms │
└───────────────────────────────┴────────┘
[crawlee._autoscaling.autoscaled_pool] INFO  current_concurrency = 0; desired_concurrency = 2; cpu = 0; mem = 0; event_loop = 0.0; client_info = 0.0
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] WARN  Encountered "crawlee.errors.SessionError: Blah blah blah", rotating session and retrying...
[ParselCrawler] ERROR Request to https://crawlee.dev failed and reached maximum retries
 Traceback (most recent call last):
  File "/home/vdusek/Projects/crawlee-python/src/crawlee/crawlers/_basic/_basic_crawler.py", line 1312, in __run_task_function
    await self._run_request_handler(context=context)
  File "/home/vdusek/Projects/crawlee-python/src/crawlee/crawlers/_basic/_basic_crawler.py", line 1407, in _run_request_handler
    await wait_for(
    ...<5 lines>...
    )
  File "/home/vdusek/Projects/crawlee-python/src/crawlee/_utils/wait.py", line 37, in wait_for
    return await asyncio.wait_for(operation(), timeout.total_seconds())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vdusek/.local/share/uv/python/cpython-3.13.0-linux-x86_64-gnu/lib/python3.13/asyncio/tasks.py", line 507, in wait_for
    return await fut
           ^^^^^^^^^
  File "/home/vdusek/Projects/crawlee-python/src/crawlee/crawlers/_basic/_context_pipeline.py", line 114, in __call__
    await final_context_consumer(cast('TCrawlingContext', crawling_context))
  File "/home/vdusek/Projects/crawlee-python/src/crawlee/router.py", line 98, in __call__
    return await self._default_handler(context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vdusek/Projects/crawlee-python/run_crawler.py", line 12, in request_handler
    raise SessionError('Blah blah blah')
crawlee.errors.SessionError: Blah blah blah
[crawlee._autoscaling.autoscaled_pool] INFO  Waiting for remaining tasks to finish
[ParselCrawler] INFO  Error analysis: total_errors=1 unique_errors=1
[ParselCrawler] INFO  Final request statistics:
┌───────────────────────────────┬────────────────────────────────┐
│ requests_finished             │ 0                              │
│ requests_failed               │ 1                              │
│ retry_histogram               │ [0, 0, 0, 0, 0, 0, 0, 0, 0, 1] │
│ request_avg_failed_duration   │ 607.8ms                        │
│ request_avg_finished_duration │ None                           │
│ requests_finished_per_minute  │ 0                              │
│ requests_failed_per_minute    │ 8                              │
│ request_total_duration        │ 607.8ms                        │
│ requests_total                │ 1                              │
│ crawler_runtime               │ 7.31s                          │
└───────────────────────────────┴────────────────────────────────┘

Checklist

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