feat: r2 adapter for the incremental cache

[james-elicx]

This PR is based off of #436 to enable auto-populating of the cache entries.

Changes

• Adds a new R2 adapter for the incremental cache.
• Caches entries using the Cache API, and updates the Cache API in the background when an R2 fetch completes.
• Adds support for populating the R2 bucket during build.
• Enables the R2 adapter in the app-router e2es.

Discussion points

• We might need to duplicate the app-router tests for each adapter we add so that we can run them for multiple adapters. Or change how the e2es are run to support being run multiple times with different adapters.

---

This is part 2 of 3 in a stack made with GitButler:

•  3  feat: commands for cli actions #479
•  2  feat: r2 adapter for the incremental cache #443 👈
•  1  feat: auto-populating d1 cache data #436

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🦋 Changeset detected

Latest commit: 33c238b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@opennextjs/cloudflare	Patch

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commit: 33c238b

[conico974]

Just one little comment, i guess the only thing remaining is what to do for #436

[james-elicx]

Just one little comment, i guess the only thing remaining is what to do for #436

Yeah I think the main outstanding questions are;

• Default to local population vs explicitly opt in for population.
• Consider having multiple commands for the adapter instead where the population is based on the command.

I was hoping to be able to talk about those this week, but didn't realise that the meeting time was changing 😓. Hopefully Victor might have a chance to take a look at the PRs at some point, otherwise we can discuss next week I guess, but I was hoping to have wrapped up the population one by now.

[vicb]

LGTM with a few nits

[conico974]

LGTM, just a small comment