refactor: simplify argument parsing and modularize bind option handling

[bhagathkrishnacdac]

Description
This PR refactors the command-line argument parser (parse_args) in the DPDK binding utility to improve structure, maintainability, and readability.

Key Changes

• Modularized Bind Options: Extracted _handle_bind_flag to isolate double-binding checks and unbind flag evaluations from the primary CLI option loop.
• Modernized Option Matching: Replaced verbose, sequential equality checks (opt == A or opt == B) with standard Python tuple membership tests.
• Compact Tuple Assignment: Consolidated multi-line state changes (such as status flags and device assignments) into clean, single-line tuple assignments.
• Deduplicated String Literals: Substituted duplicated help guidelines with a module-level constant (USAGE_INFO).