Update access level for types that will go into WordPressData

[mokagio]

This comes from the "workbench" work from #24242. It basically adds public to a bunch of model-related files, so that when we'll move them to WordPressData, the PR diff will be easier to parse.

Part of #24165

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 25.9. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr24326-81ec143
	Version	25.8
	Bundle ID	org.wordpress.alpha
	Commit	81ec143
	App Center Build	WPiOS - One-Offs #11867

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr24326-81ec143
	Version	25.8
	Bundle ID	com.jetpack.alpha
	Commit	81ec143
	App Center Build	jetpack-installable-builds #10890

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[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ EXC_BREAKPOINT: WordPress/Blog+Post.swift Blog.createPage View Issue

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