Display README as long description on PyPI (Python)

[leha-code]

What does this PR do?

This PR fixes the lack of README contents on PyPI by adding the long_description option into the setup.py template. There was a previous invalid setup.cfg file that was supposed to add the README contents as long description but since that isn't needed anymore it's deleted.

Test Plan

Almost no code has been changed. When generating an SDK the template takes out the sdk.readme option for the long description

Related PRs and Issues

(If this PR is related to any other PR or resolves any issue or related to any issue link all related PR and issues here.)

Have you read the Contributing Guidelines on issues?

Yes