Extend Zig icon to ZON files

[mataha]

Description

This commit extends Zig icon to ZON (Zig Object Notation) files.

Motivation and Context

zig init now creates a build.zig.zon file while initializing a new project.

How Has This Been Tested?

• file_type_zon.zon

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have read the CONTRIBUTING document.

[deathaxe]

Which package provides a reals syntax for source.zon?

Currently appears, adding zon extension to zig syntax would be sufficient.

[mataha]

Which package provides a reals syntax for source.zon?

Currently appears, adding zon extension to zig syntax would be sufficient.

Then I'll do just that - no idea when will this land in the Zig package.

[mataha]

Added zon to Zig syntax.