Add module-level docstrings and helper utility docstrings

Co-authored-by: varun-r-mallya <100590632+varun-r-mallya@users.noreply.github.com>

pythonbpf/binary_ops.py

@@ -1,3 +1,10 @@
+"""
+Binary operations handling for BPF programs.
+
+This module provides functions to handle binary operations (add, subtract,
+multiply, etc.) and emit the corresponding LLVM IR instructions.
+"""
+
 import ast
 from llvmlite import ir
 from logging import Logger