[DOP-14059] Add Troubleshooting guide

[dolfinus]

Change Summary

• Improve documentation about logging, add logs example
• Add separated page for Spark troubleshooting - how to restart Spark session, how to change driver & executor logs level.
• Add generic troubleshooting guide.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.46%. Comparing base (3cd5dfc) to head (540a246).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #275   +/-   ##
========================================
  Coverage    94.46%   94.46%           
========================================
  Files          204      204           
  Lines         8047     8047           
  Branches      1409     1409           
========================================
  Hits          7602     7602           
  Misses         320      320           
  Partials       125      125           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dolfinus]

Приветствуются идеи по тому, что еще можно такого добавить в инструкцию/изменить/etc.