fix(rust): Fix null handling in `collect_statistics` of parquet reader #13775

Job	Run time
check-features	2m 15s
integration-test (ubuntu-latest)	1m 59s
test (ubuntu-latest)	2m 9s
integration-test (windows-latest)	1m 55s
test (windows-latest)	1m 51s
check-wasm	2m 11s
	12m 20s

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