Adding new Conversion feature : Binary to Gray & Gray to Binary

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• [x] This pull request is all my own work -- I have not plagiarized it.
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• [x] Fixes #4524 Solved

Hi @yanglbme, @debasishbsws, @vil02, @BamaCharanChhandogi, I submitted a pull request . Could someone kindly review it and provide feedback if needed? Your input is valuable. Thanks!

Hi @yanglbme, @debasishbsws, @vil02, @BamaCharanChhandogi, I had added test cases for both binary to gray and gray to binary conversions . Could someone kindly review it and provide feedback if needed? Your input is valuable. Thanks!

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