Add support for Python 3.6 and Python 3.7

[hmurari]

Support for Python3.6 and 3.7

A lot of people are still using Python 3.6 and Python 3.7 models. Need to add support for this.

What to implement

We need to implement pipeline changes in Poetry - so we can compile and test the build for all these versions and push them in. We can do this only when a PR is created to be merged to main branch. Changes will be primarily for the Azure pipelines yml file. There might be some cases where things might break for Python 3.6, 3.7 -- in those cases we need to make sure to fix our code to support them.