Add new Printer definition for Comgrow T300

[JoGrob]

Description

This pull request adds printer definitions for Comgrow T300.

Type of change

• Printer definition file(s)

How Has This Been Tested?

n/a

Test Configuration:

• Operating System:

Windows 11

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

[github-actions]

Test Results

24 518 tests   24 510 ✅  49s ⏱️
     1 suites       2 💤
     1 files         0 ❌  6 🔥

For more details on these errors, see this check.

Results for commit 14c10d2.

♻️ This comment has been updated with latest results.

[github-actions]

Error Files:

• 'File: resources/extruders/comgrow_t300_extruder_0.def.json must not be deleted as it is not allowed. It will create issues upgrading Cura'

[GregValiant]

Hello.
I was wondering if this is a Sovol printer. If it is - should it be included with the other Sovol printers and inherit their 'base' file?
Will there be a submission for the T500? Multiple files would need a base file and then the actual model definition files would only contain the differences.
Did you consider adding "variant" nozzle sizes? People complain when there are no nozzle options.