feat: flag to disable hop-by-hop defenses

[aeneasr]

Ory Oathkeeper v0.44.4 uses the new Rewrite feature of Golang's reverse proxy. This will strip any X-Forwarded headers from upstream requests. This however is not always desirable which is why a new config flag serve.proxy.trust_forwarded_headers was introduced to optionally enable the forwarding of X-Forwarded headers.

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