new bi sample benchmark tests v2 (fromPR #1995)

[grusev]

Reference Issues/PRs

From PR #1995 (all comments addressed)

Sample test benchmark for using one opensource BI CSV source.
The logic of a test is 
    - download if parquet file does not exists source in .bz2 format
    - convert it to parquet format
    - prepare library with it containing  several symbols that are constructed based on this DF
    - for each query we want to benchmark do a pre-check that this query produces SAME result on Pandas and arcticDB
    - run the benchmark tests

What does this implement or fix?

Any other comments?

Checklist

Checklist for code changes...

• Have you updated the relevant docstrings, documentation and copyright notice?
• Is this contribution tested against all ArcticDB's features?
• Do all exceptions introduced raise appropriate error messages?
• Are API changes highlighted in the PR description?
• Is the PR labelled as enhancement or bug so it appears in autogenerated release notes?

[alexowens90]

Any reason these changes are in common.py? They're only used by bi_benchmarks.py, so should live in there, no?