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

[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

Component(s)

C++, Parquet

[pitrou]

Issue resolved by pull request 49919
#49919