chore: import upstream snapshot with attribution

test/fuzzing/fuzz_json_seed_corpus/info1.json

@@ -0,0 +1 @@
+{"judge":false, "spur":-2, "data":[], "info":[],"content":[]}

test/fuzzing/fuzz_json_seed_corpus/info2.json

@@ -0,0 +1 @@
+[{"container": 1000, "host": 1000, "size": 2}]

test/fuzzing/fuzz_json_seed_corpus/info3.json

@@ -0,0 +1 @@
+{"content":[{"distance":1,"unknown_member":2,"ext":{"age":1666666666, "databyte":"d2VsY29tZQ==", "enumtype":1},"uid":"someone"},{"distance":10,"unknown_member":20,"ext":{"age":1666666660, "databyte":"d2VsY29tZQ==","enumtype":2},"uid":"someone0"}], "judge":false,"spur":2, "data":[1,2,3,4,5,6,7,8,9,10]}