Parquet: Should DataPageV2 shrink_to_fit?

[mapleFU]

Is your feature request related to a problem or challenge?

There're two related changes:

1. DataPageV1 will shrink to fit if possible
2. perf(parquet): use Cursor in ZSTDCodec to avoid Vec alloc and copy #10345 This will avoid copying, but making more memory used

So, for DataPageV2, this would occupies more memory. Don't know should we enlarge memory?

Describe the solution you'd like

IDK, maybe provide a shrink_to_fit ( which introduing memcpy ).

Describe alternatives you've considered

IDK

Additional context

No response