[C++][Parquet][CI] Add fuzzer for encoder/decoder roundtrip #49329
Description
Describe the enhancement requested
The idea is to have a dedicated fuzzer that exercises a simple encoding roundtrip without all the overhead of Thrift metadata. See https://lists.apache.org/thread/b64ts1xtq2b4y6dc2ldj7wd706crd53l
Component(s)
C++, Continuous Integration, Parquet