PERF-#5296: Partition parquet file if it has too few row groups

[dchigarev]

What do these changes do?

The PR corrects unbalanced partitioning after .read_parquet(). It basically applies the logic of qc.repartition() but at the partitions level (for some reason, this implementation works much faster):

• first commit message and PR title follow format outlined here

  NOTE: If you edit the PR title to match this format, you need to add another commit (even if it's empty) or amend your last commit for the CI job that checks the PR title to pick up the new PR title.

• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves Modin doesn't partition DataFrames read from a parquet file if the file itself isn't partitioned #5296
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

[anmyachev]

@YarShev any other comments?