Refactor and enhance node configuration generator and stress tester scripts

[seregatipich]

This pull request includes significant updates to two scripts:

1. generate-test-node-config.py:

-Refactored to use more Pythonic code structures and practices
-Improved error handling and input validation
-Enhanced JSON configuration generation for global and local configs
-Added support for generating DHT, catchain, liteserver, and validator configurations
-Implemented base64 encoding and SHA256 hashing for catchain tags
-Added functionality to generate random node IDs when specified

2. stress_tester.py (renamed from stress.py):

-Complete rewrite of the stress testing script
-Implemented a more robust code generation system for creating test cases
-Added support for various control structures including if-else, loops, and try-catch blocks
-Introduced a State class to manage test execution state
-Implemented multiple Code classes to represent different types of operations
-Added functionality to compile and run generated code using FunC and Fift
-Improved test case generation with configurable parameters
-Enhanced output and error reporting