Parallelize HTTP requests and fix regex replacement error in dotdotslash.py

[ByteMastermind]

This pull request introduces two major improvements to dotdotslash.py:

Parallelize HTTP Requests:

• Implements Python’s ThreadPoolExecutor to run HTTP requests concurrently, reducing the overall execution time for network-bound operations.
• Refactors URL generation and request processing into a dedicated task function.
• Uses a set to avoid duplicate URL requests during iteration while preserving colored output and verbose logging.

Fix Regex Replacement Error:

• Addresses the 'bad escape \w' error encountered in dotdotslash.py.
• Modifies the re.sub call to use a lambda function, ensuring that the replacement string is returned literally and preventing Python’s regex engine from misinterpreting escape sequences.
• This fix resolves issues when the replacement string contains backslashes (for example, file paths provided by match.py).