Add DEFER_ENDPOINT environment variable support

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Latest commit: 354b2e5

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🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@defer/client	1.2.0-alpha-20230318051710-354b2e5	npm ↗︎ unpkg ↗︎