fix: add missing body mode fields.

Signed-off-by: usize <mofoster@redhat.com>

Author: usize

tests/fuzz/fuzz_targets/fuzz_filter_pipeline.rs

@@ -57,8 +57,10 @@ fuzz_target!(|data: &str| {
             health_registry: None,
             request: &request,
             request_body_bytes: 0,
+            request_body_mode: praxis_filter::BodyMode::Stream,
             request_start: std::time::Instant::now(),
             response_body_bytes: 0,
+            response_body_mode: praxis_filter::BodyMode::Stream,
             response_header: None,
             response_headers_modified: false,
             rewritten_path: None,