Python linter and license banner check

[SorinOlari]

Description

• Added autopep8 as Python formatter and linter. Added linter check to the CI pipeline
• Added Python files to the license banner checker
• Updated yamllint rules

Also, please list any issue that this PR is intended to fix.

• Fixes issue # Add Python linter and license banner check #167

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Code cleanup/refactoring
• CI system update

How Has This Been Tested?

Intentionally introduced errors in the license banner text to ensure the script detects them as expected.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[casaroli]

Suggested change

	if [ "${first_line#\#\!/bin}" != "$first_line" ] || [ "${first_line#\#\!/usr/bin}" != "$first_line" ]; then
	if [ "${first_line#\#\!/}"x != "${first_line}x" ]; then

[casaroli]

all good, we can simplify the testing for the shebang.