header: caddyfile: Defer header operations for deletions or manually

See https://caddy.community/t/caddy-server-that-returns-only-ip-address-as-text/6928/6?u=matt

In most cases, we will want to apply header operations immediately,
rather than waiting until the response is written. The exceptions are
generally going to be if we are deleting a header field or if a field is
to be overwritten. We now automatically defer header ops if deleting a
header field, and allow the user to manually enable deferred mode with
the defer subdirective.

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