feat: add zebra printer

[ji5485]

Summary

This PR adds Zebra(ZPL-based) printer.
Enabled ZPL printing without manual coordinate management, making it behave like ESC/POS for easier layout handling.

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Changes

• Printer interface
  • Added line(width: number, character?: string): this method.
    • Prevents long command strings when Line component calls text() repeatedly.
    • Provides a ZPL-optimized way to render horizontal lines.
  • Added convertTextAlignInRow(align: Align): Align method.
    • Ensures correct alignment mapping for each Text component within a Row.
• BasePrinter class
  • Implemented line() and convertTextAlignInRow() methods with default behaviors.
• Line.print
  • Updated to call printer.line() instead of multiple printer.text() calls.
• Row.print
  • Updated to use printer.convertTextAlignInRow() when rendering text at each position.
• ZebraPrinter class
  • Added full implementation of ZPL-compatible printer with the following methods:
    • setCharacterSet(set: CharacterSet): this;
    • setTextFont(font: TextFont): this;
    • setTextBold(bold: boolean): this;
    • setTextSize(width: TextSize, height: TextSize): this;
    • setTextUnderline(underline: TextUnderline): this; (Not officially supported by ZPL, but could be implemented through non-standard or workaround methods.)
    • setTextNormal(): this;
    • setAlign(align: Align): this;
    • invert(enabled: boolean): this; (Not officially supported by ZPL, but could be implemented through non-standard or workaround methods)
    • text(data: string): this;
    • line(width: number, character?: string): this;
    • raw(data: Uint8Array): this;
    • line(character: string, width: number): this;
    • newLine(): this;
    • cut(partial?: boolean): this; (not supported)
    • image(image: Image, options?: ImageToRasterOptions): this; (to be implemented)
    • qrcode(data: string, options?: QRCodeOptions): this; (to be implemented)
    • barcode(data: string, type: BarcodeType, options?: BarcodeOptions): this; (to be implemented)
    • cashdraw(pin: CashDrawerPin): this; (not supported)
    • initialize(): this;
    • getData(): Uint8Array;
    • clear(): this;
    • debug(): this;
    • convertTextAlignInRow(align: Align): Align;