[ManupaKDU]

💡 What: Optimize file reading and memory allocation in netgear-fit-padding.py by pre-allocating a single bytearray and using f.readinto().
🎯 Why: The original code read the entire file into memory as bytes, converted it to bytearray, and then extended it with another bytearray. This required multiple memory allocations and copies for potentially large firmware images.
📊 Impact: Reduces memory usage and improves performance significantly when modifying firmware images.
🔬 Measurement: Can be verified by profiling memory allocations during image padding.

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PR created automatically by Jules for task 6135397278818963499 started by @manupawickramasinghe

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