chore(router): refactor hydration setting

[EvanBacon]

Why

• We were completely invalidating the cache to change the rendering output mode. This was mostly just an artifact of when expo-router was in a different repo.

How

• I've refactored the hydration marker to not invalidate the cache at all or even go through Babel, we just inject it as a script global in the HTML during static rendering.
• This is pulled out of the RSC branch.
• I did notice however that we aren't enabling hydration in development at all. It appears to be broken on the suspense boundaries. We might not be able to fix this until we have RSC support enabled.

Test Plan

• E2E test for this will pass.
• Dev works as expected.
• Cache doesn't invalidate between output modes.

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: 122bbd1

Fingerprint diff

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