Base image introduction to Python SDK Devcontainer

[mml5bg]

Describe your changes

Python base image has been introduced to Python SDK container.

Issue ticket number and link

Checklist - Manual tasks

• [x] Examples are executing successfully
• [ ] Created/updated unit tests. Code Coverage percentage on new code shall be >= 80%.
• [ ] Created/updated integration tests.
• [x] Devcontainer can be opened successfully
• [x] Devcontainer can be opened successfully behind a corporate proxy
• [x] Devcontainer can be re-built successfully
• [ ] Extended the documentation (e.g. README.md, CONTRIBUTING.md, Velocitas)

[mml5bg]

@BjoernAtBosch License headers are updated only to files where changes are made and pre-commit hook for insert license from license_header.txt is disabled until we find appropriate solution for it.