N2R-31

[jiawei-lim]

• Added more example notebooks for testing
• Performed code clean up on generator and template file code
• Changed all "print" statements to use logger
• Remove /generator directory init to prevent import conflicts
• Implemented test cases for generator,helper, and fast api template file
• Integrated tests into workflow

[jiawei-lim]

Created a separate workflow file so it can be manually triggered if needed

[jiawei-lim]

Extracted main to a separate method to improve testability, or else to trigger the tests we will need to call it by importing sys