Allow configurable commands for image printing

[wahyubaskara]

This pull request introduces a new feature that allows for configurable image printing commands, specifically for ESC/P printers.

Summary

Previously, QZ-Tray used command (ESC *) for printing images to ESC/P printers. This change introduces support for two additional, widely-used image printing commands: GS v 0 and GS ( L.

The primary goal is to offer better performance for image printing with alternative commands.

Key Changes

• Configurable Image Commands: A new imageEncoding option has been added to the print configuration. This allows users to specify which command set to use for image printing.
  • ESC_STAR (default): The original ESC * command.
  • GS_V_0: The GS v 0 command.
  • GS_L: The GS ( L command.
• New Encoders:
  • GsV0Encoder.java: Implements the logic for the GS v 0 command.
  • GsLEncoder.java: Implements the logic for the GS ( L command.

How to Use

To use one of the new image printing commands, add the imageEncoding option to your printing configuration. For example:

{
    type: 'raw',
    format: 'image',
    flavor: 'file',
    data: fileUrl,
    options: { language: 'ESCPOS', imageEncoding: 'GS_L' },
}

If the imageEncoding option is not specified, the system will default to ESC_STAR to maintain backward compatibility with existing setups.

[tresf]

@wahyubaskara thanks for the PR!

I'll probably change esc_star with esc_asterisk to avoid name confusing with future Star Micronics Star Line Mode Commands.

It will be some time before I can do a proper review. I may move some components or API names around as part of this effort. I assume you're OK if I use your branch for this effort?

[wahyubaskara]

Yes, feel free to use my branch and make any changes needed

[tresf]

Sorry for the delay on this. I've approved the workflows so you can get the artifacts. I may remove the artifact creation from this PR as it's unrelated to this feature.

I have not yet begun reviewing the code, but it's on the todo list.