Initial Port of Jetpack Tiled Gallery Block

[SiobhyB]

Fixes wordpress-mobile/gutenberg-mobile#4268

This PR brings the first iteration of the Tiled Gallery block to the Android app.

To test: Please refer to the Jetpack PR as the "central PR" with the most up-to-date testing instructions.

Related PRs

• Jetpack: [RNMobile] Initial Port of Jetpack Tiled Gallery Block Automattic/jetpack#21849
• Gutenberg Mobile: Initial Port of Jetpack Tiled Gallery Block gutenberg-mobile#4291
• iOS: Initial Port of Jetpack Tiled Gallery Block WordPress-iOS#17618
• Gutenberg: [RNMobile] Add registration of new block for native mobile WordPress/gutenberg#37776

Regression Notes

1. Potential unintended areas of impact

This PR adds a new block, and it is only available on development builds, so there is little potential impact on other parts of the app.

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

We just relied on existing Gutenberg Mobile and WPiOS tests.

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

We added a test in wordpress-mobile/gutenberg-mobile#3903 but wordpress-mobile/gutenberg-mobile#4168 needs to be resolved before we can add more tests.

PR submission checklist:

• I have completed the Regression Notes.
• 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.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APKs:

• Jetpack-pr-15619-build-118288.apk

• WordPress-pr-15619-build-118288.apk

[guarani]

I gave this a test locally and the Square layout works as expected.

We'll have to tag a Gutenberg Mobile release, update this PR, and then merge.

[peril-wordpress-mobile]

	Warnings
⚠️	PR is not assigned to a milestone.

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