Remove Python v2 code from webexpythonsdk v2

[Joezanini]

This will be one of the changes that will eventually allow Python v3 devs to do a simple refactor (replacing the names and bumping the version) to get and use the the latest version of the package with the Python v3.11+ compatible code, without breaking things for any holdouts that are using Python v2.

Thus the compatibility becomes:

• webexteamssdk v1: supports Python v2 and up to Python v3.10
• webexpythonsdk v2: supports Python v3.10+