Switch circle CI to tox

[boris-42]

It makes sense to use the same technologies locally and in CI
as it simplifies local debugging and verifing changes

Before this patch we did run sdist (bulding package) and functional
tests in CI and we were uploading coverage report to covecod

After this PR we are adding code style jobs, unittests with coverage
as well as keeping old jobs in place (but run through tox)

As well now we have 2 reports to upload one for functional tests
one for unittests

[boris-42]

@swilly22 here is the PR that should address circle ci issues, but for some reason circle Ci is not running on my PR

[boris-42]

@swilly22 I saw some very old
configuration option. It seems like you'll need to enable it in CircleCI configuration. so circle CI is triggered on opened PR

[swilly22]

Thank you @boris-42, I've enabled CI on fork PRs

[boris-42]

@swilly22 CI is still not working, hm will prepare one more PR

[swilly22]

@boris-42 still no go

#!/bin/bash -eo pipefail
pip install tox
Collecting tox
  Downloading https://files.pythonhosted.org/packages/e0/79/5915b9dad867e89bb6495456acfe5d4e2287e74dfa29c059f7b127d5480e/tox-3.20.1-py2.py3-none-any.whl (83kB)
    100% |████████████████████████████████| 92kB 3.6MB/s eta 0:00:01
Collecting virtualenv!=20.0.0,!=20.0.1,!=20.0.2,!=20.0.3,!=20.0.4,!=20.0.5,!=20.0.6,!=20.0.7,>=16.0.0 (from tox)
  Downloading https://files.pythonhosted.org/packages/1a/c6/bb564f5eec616d241e85d741f00a07f5f50ea12989022ad49bc66876993c/virtualenv-20.2.2-py2.py3-none-any.whl (5.7MB)
    100% |████████████████████████████████| 5.7MB 289kB/s eta 0:00:01
Collecting pluggy>=0.12.0 (from tox)
CircleCI received exit code 2

https://app.circleci.com/pipelines/github/RedisGraph/redisgraph-py/459/workflows/c2deb5ab-7f88-4805-81e9-e4e041cb154f/jobs/821