Add fuzz test for complex codec unmarshalling #1846
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Why this should be merged
Adds fuzz testing for the reflect codec.
How this works
Tries to unmarshal random bytes. If the bytes are valid, then verifies that marshaling work correctly and that the size is calculated correctly.
How this was tested
Ran the fuzzer for like 5 hours got around 200 interesting cases. The fuzzer didn't seem to be able to figure out maps with multiple entries when the maps weren't constant size.