Multi heating zone

[GiacomoGuaresi]

#Description
This PR implements logic to handle a multi-zone nozzle heating configuration for modded_printer_pellet printer models.

Changes introduced:

• Multi Heating Zone feature: when enabled, users can independently set the temperature for each zone, instead of setting a single temperature for the nozzle, this entry will enable in the printer configurations the extruder zone number and in the materials the various set temperatures for each present zone, these will be divided into first_layer and other_layer.
• Updated G-code command (M104): the M104 command now supports a new Z{zone_number} parameter, which allows targeted zone heating. This feature is compatible with multi-extruder printers.
• The previous behavior of the M104 command remains unchanged when the multi-zone heating option is disabled.

Impact:

This update improves flexibility and accuracy in temperature control, especially for advanced multi-zone certification.

Breaking changes:

There are no breaking changes. Existing functionality remains intact when multi-zone heating is disabled.

Limitations and features to improve:

• Hard coded limit of 10 temperature zones: Currently PR supports a maximum of 10 temperature zones, hard coded limit to be changed in the future
• Equal number of temperature zones for each extruder: Currently all extruders in the printer must have the same zone number

Screenshots/Records/Graphs

[TBD]

Testing

The following tests were conducted to verify the changes:

1. Generated a G-code file with correctly modified M104 commands, including the new Z{zone_number} parameter.
2. Verified that disabling the multi-zone heating option retains the previous behavior without any regression.