ITF-14 - Bearer Bar

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Hi!

First of all, congrats for the great work with this lib!

So, I'm wanting to use this lib to create ITF-14 using the GS1 implementation, but it's mandatory for my use case to create the "bearer bar", any planning to add this or chance to accept a PR for it?

**ITF-14:**
https://en.wikipedia.org/wiki/ITF-14
https://www.gtin.info/itf-14-barcodes/

**From the oficial GS1 docs - Page 232** (https://www.gs1br.org/hackathon/Documents/GS1_General_Specifications.pdf):

> 5.3.2.4 Bearer bars
The purpose of a bearer bar is to equalise the pressure exerted by the printing plate over the entire
surface of the symbol and to enhance reading reliability by helping to reduce the probability of
misreads or short scans that may occur when a skewed scanning beam enters or exits the barcode
through its top or bottom edge.
The bearer bar is mandatory unless it is not technically feasible to apply it (in which case reading
reliability will be reduced).
GS1 General Specifications
Release 16.0, Ratified, Jan 2016 © 2016 GS1 AISBL Page 233 of 438
For printing methods requiring printing plates, the nominal bearer bar has a constant thickness of
4.83 millimetres (0.190 inch) and must completely surround the symbol, including its Quiet Zones,
and butt directly against the top and bottom of the bars (dark bars) of the symbol.
For printing methods that do not require printing plates, the bearer bar SHALL be a minimum of
twice the width of a narrow bar (dark bar) and need only appear at the top and bottom of the
symbol, butting directly against the top and bottom of the symbol bars (dark bars). The bearer bar
may extend above and below the Quiet Zones. However, it is not mandatory to print the vertical
sections of the bearer bar. See figure 5.3.2.4-1.

JsBarcode:

Expected:

Start by reviewing JsBarcode's existing ITF-14 generation and rendering entry points, then compare the current and expected images with the linked GS1 bearer-bar requirements. Done means ITF-14 output includes the requested bearer bar while preserving the existing symbol and quiet zones; the issue does not name specific files or tests to run.

Written by the indexing model from the issue text.