Custom Properties (custom_property and custom_property_values events)

[colbylwilliams]

Related to issue #416 and PR #417

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Before the change?

• initial support for custom_property and custom_property_values (add custom_property and custom_property_values #417) events was added during preview of Custom Properties and doesn't match the GA'd event payloads.

After the change?

• Includes test (GA'd) payloads for both custom_property and custom_property_values events
• Updates the models for both events to correctly deserialize the event payloads
• Adds custom_property and custom_property_values events to app events (subscriptions)
• Adds organization_custom_properties and repository_custom_properties app permissions
• Adds custom_properties field to Repository

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[JamieMagee]

Thanks for the PR. This change is included in v2.2.1.