avoid unnecessary buffer copies on opennext.js response

[anonrig]

Several optimizations but I think the most impactful one is to avoid having an unnecessary copy everytime getBody() is called.

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🦋 Changeset detected

Latest commit: a8463c7279592b651375d7ed2b927e4ba3e2d772

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

This PR includes changesets to release 2 packages

Name	Type
@opennextjs/aws	Patch
app-pages-router	Patch

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commit: a8463c7