[Parquet] Use u64 for SerializedPageReaderState.offset & remaining_bytes, instead of usize

[JigaoLuo]

Which issue does this PR close?

• Closes [Parquet] [Question / Potential Bug Report] Should SerializedPageReaderState.offset & remaining_bytes be u64 instead of usize? #7910

Rationale for this change

There is a copy from my issue page:

arrow-rs/parquet/src/file/serialized_reader.rs

Lines 471 to 472 in 2be261b

	/// The current byte offset in the reader
	offset: usize,

My concern is about the type of offset in SerializedPageReaderState. Should it be u64 instead of usize? If I understand correctly, this offset represents a global position within a Parquet file, which can easily exceed 4 GB. On 32-bit environments (e.g., WebAssembly), usize is limited to u32's max, which could lead to problems with larger files.

What changes are included in this PR?

This PR does type changes only for SerializedPageReaderState.offset & remaining_bytes

Are these changes tested?

I can pass with local unit tests via cargo test -p parquet

Are there any user-facing changes?

No

[XiangpengHao]

Thank you @JigaoLuo this looks good to me! left minor optional doc change.

[JigaoLuo]

Thank you @XiangpengHao for reviewing. I have updated the doc.

[alamb]

Thanks @JigaoLuo and @XiangpengHao -- this makes sense to me

@etseidl or @jhorstmann do you have any concerns about this change?

[jhorstmann]

Looks good to me, thanks!

[alamb]

Thanks again @JigaoLuo and thanks @mbrobbel and @jhorstmann

[JigaoLuo]

Thank you to all the reviewers