feat: support format option in custom type models

[angeloashmore]

Types of changes

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

Description

This PR adds support for the format option in custom type models.

const mock = createMockFactory();
mock.value.customType({ format: "page" });

If no format value is provided, a pseduo-random one is selected.

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

[github-actions]

size-limit report 📦

Path	Size
dist/index.js	12.35 KB (+0.19% 🔺)
dist/index.cjs	20.78 KB (+0.12% 🔺)