Convert ReaderPost mapping to Swift

[kean]

I used TDD to reduce the risk of regression and performed manual tests.

[dangermattic]

	2 Warnings
⚠️	Modules/Package.swift was changed without updating its corresponding Package.resolved. If the change includes adding, removing, or editing a dependency please resolve the Swift packages as appropriate to your project setup (e.g. in Xcode or by running swift package resolve). If the change to the Package.swift did not modify dependencies, ignoring this warning should be safe, but we recommend double checking and running the package resolution just in case. .
⚠️	This PR is larger than 500 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

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	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	31223
	Version	PR #25301
	Bundle ID	org.wordpress.alpha
	Commit	985fa3a
	Installation URL	1i5ijmrdsphl0

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	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	31223
	Version	PR #25301
	Bundle ID	com.jetpack.alpha
	Commit	985fa3a
	Installation URL	10pq56igr4790

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🤖 Build Failure Analysis

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[crazytonyli]

I get this property may not be available in the Swift API, but is there a safer way (at least using a symbol, rather than a string) to do this?

[kean]

It's an interesting issue. The RCA is the following (generated):

Here's the problem: RemoteReaderCrossPostMeta is defined in Swift (WordPressKitModels), but the ObjC header in WordPressKitObjC only has @Class
RemoteReaderCrossPostMeta (a forward declaration). When Swift imports the WordPressKitObjC module, it can't resolve this forward-declared type to the
actual Swift class across module boundaries, so the crossPostMeta property is dropped from the Swift-visible interface.

I opted to fix it by converting RemoteReaderCrossPostMeta, a small class, back to ObjC so that the entire RemoteReaderPost object graph is in ObjC. I also added nullability annotations (everything nullable).

[sonarqubecloud]

Quality Gate passed

Issues
27 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud