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[C++][Parquet] Catch std::vector allocation errors in encoding fuzzer #49918

Description

@pitrou

Describe the enhancement requested

The Parquet encoding fuzzer can allocate a std::vector of an arbitrary size, but doesn't catch any allocation failure. This can produce OOMs in the fuzzer.

Issue found by OSS-Fuzz: https://issues.oss-fuzz.com/issues/506741109

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C++, Parquet

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