Add extruder start/end gcode duration settings

[casperlamboo]

Description

This PR adds the following settings

• Extruder start gcode duration
• Extruder end gcode duration
  By entering a duration (expressed in seconds) for this setting the amount of time is added to the time estimation for a nozzle switch. This makes it possible to more accurately tune print time estimations, especially for printers that have longer nozzle switching sequences. Both these settings default to 0; if no value is entered no amount of time is added to the print time estimations.

Also see CuraEngine PR: Ultimaker/CuraEngine#1981

CURA-11099

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Printer definition file(s)
• Translations

How Has This Been Tested?

Yas

Test Configuration:

• Operating System: MacOS 13

Checklist:

• My code follows the style guidelines of this project as described in UltiMaker Meta and Cura QML best practices
• I have read the Contribution guide
• I have commented my code, particularly in hard-to-understand areas
• I have uploaded any files required to test this change

[rburema]

Looks good, just some 'description' changes.