Create DataStoreQuery type to perform query

[crazytonyli]

As discussed on Slack, here is the PR for changing the associatedtype Query in protocol DataStore to a concrete type.

I still have the same concerns about this approach, though. There is no straightforward way to create a concrete Query type that would support all different kinds of "data store".

For example, the existing enum UserDataStoreQuery and the new DataStoreQuery in this PR won't support SQL queries. Vise-versa, If we create a SQL-like query (i.e., DataStoreQuery.where(key: String, equals: Value)), we won't be able to support this search with an in-memory dict/list of Swift structs.

I'm leaning towards keeping the existing DataStore implementation where it does not put any restrictions on the concrete type of DataStore.Query. It's up to the specific DataStore implementation to decide what type of Query it supports. Let me know what you think.

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[dangermattic]

	1 Message
📖	This PR is still a Draft: some checks will be skipped.

Generated by 🚫 Danger

[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	pr23867-75f15dc
	Version	25.4.2
	Bundle ID	org.wordpress.alpha
	Commit	75f15dc
	App Center Build	WPiOS - One-Offs #11141

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[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	pr23867-75f15dc
	Version	25.4.2
	Bundle ID	com.jetpack.alpha
	Commit	75f15dc
	App Center Build	jetpack-installable-builds #10180

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

Version 25.6 has now entered code-freeze, so the milestone of this PR has been updated to 25.7.