Add diverse Python examples and algorithms

[Sindhu1702013]

Added python programs covering a wide range of topics and functionalities.

• Introduces new Python examples demonstrating core language features, data handling, algorithms, and mathematical concepts.
• Includes programs illustrating fundamental concepts like variable scope (P02_VariableScope.py) and list operations (P03_ListsOperations.py).
• Adds examples for data serialization and deserialization using json (P51_PythonJSON.py), csv (P54_PythonCSV.py), and pickle (P60_PickleModule.py) modules.
• Incorporates implementations of sorting algorithms such as Bucket Sort (P52_BucketSort.py) and Shell Sort (P53_ShellSort.py).
• Features utility programs for argument parsing (P29_ArgumentParser.py), list comprehensions (P50_ListComprehensions.py), and various word/number puzzles (Isogram, Pangram, Anagram, Perfect Number, Pascal's Triangle).
• Includes a basic tutorial on using SQLAlchemy for Object Relational Mapping (P80_SQLAlchemyTutorial.py).
• A total of 18 new Python files have been added under the p123/ directory.

[email-to: sindhuja.golagai@techolution.com]