Exposed bank logo url and added to sample#38

Devenom1 wants to merge 3 commits intorazorpay:masterrazorpay/razorpay-flutter-customui:masterfrom

Devenom1:expose-get-bank-logo-url-methodDevenom1/razorpay-flutter-customui:expose-get-bank-logo-url-methodCopy head branch name to clipboard