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escpos_arabic: Dart package prints correct Arabic text on ESC/POS receipt printers

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A new Dart package called escpos_arabic generates ESC/POS byte commands for thermal receipt printers, with Arabic support as a core feature. It shapes Arabic letters, reorders right-to-left lines, and encodes text to CP864 or Windows-1256, while also handling layout, images, barcodes, and QR codes. Printing Arabic has long been difficult because printers lack letter shaping and right-to-left handling, and the package addresses both issues. It offers a code page mode and a raster rendering mode that draws text as an image through Flutter's text engine. The package only builds the bytes and leaves transport over Bluetooth, USB, or network to the developer, and it is presented as a maintained alternative to esc_pos_utils.

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