Update Parametric Study to Check for Duplicate Entries

[safeerehman]

📝 Description of the feature

Update the parametric_study class methods add_inputs and add_summaries to check for duplicate entries in the existing parametric study instance before adding another one.

💡 Steps for implementing the feature

• add_inputs and add_summaries should now return the number of new entries added and the number of duplicate entries skipped
• can use a method _check_for_duplicate_inputs that takes in a pandas series and returns a bool depending on the entry, if it is found or otherwise.

🔗 Useful links and references

No response