Provide an interface for fuzzing sequence producer plugins

tests/fuzz/simple_round_trip.c

@@ -22,6 +22,7 @@
 #include "fuzz_helpers.h"
 #include "zstd_helpers.h"
 #include "fuzz_data_producer.h"
+#include "fuzz_third_party_seq_prod.h"
 
 static ZSTD_CCtx *cctx = NULL;
 static ZSTD_DCtx *dctx = NULL;
@@ -129,6 +130,8 @@ static size_t roundTripTest(void *result, size_t resultCapacity,
 
 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
 {
+    FUZZ_SEQ_PROD_SETUP();
+
     size_t const rBufSize = size;
     void* rBuf = FUZZ_malloc(rBufSize);
     size_t cBufSize = ZSTD_compressBound(size);
@@ -164,5 +167,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
     ZSTD_freeCCtx(cctx); cctx = NULL;
     ZSTD_freeDCtx(dctx); dctx = NULL;
 #endif
+    FUZZ_SEQ_PROD_TEARDOWN();
     return 0;
 }