Refactoring of circleci config to have workflows and better testing on different python versions
Change the continuum/miniconda3 image for testing to circleci/python:3.7. It provides out of the box features like poetry and curl which are needed in the pipeline.
This PR introduces the following:
continuum/miniconda3image for testing tocircleci/python:3.7. It provides out of the box features likepoetryandcurlwhich are needed in the pipeline.