GH-50689: [C++][Parquet] Add IEEE-754 total order and nan count for floating types

[HuaHuaY]

Rationale for this change

Implement IEEE 754 total order and NaN counts from apache/parquet-format#514.

What changes are included in this PR?

• Use IEEE total order by default, with a writer-level TYPE order fallback.
• Add nan_count to statistics and nan_counts to PageIndex.
• Preserve NaN payloads and signed zero in statistics and dictionary encoding.
• Make Dataset pruning NaN-aware (skip FLOAT16 numeric bounds until comparison kernels are available).

Are these changes tested?

Yes.

Are there any user-facing changes?

• cpp/src/parquet/types.h: Adds ColumnOrder::IEEE_754_TOTAL_ORDER.
• cpp/src/parquet/properties.h: Adds the floating-point column-order writer property.
• cpp/src/parquet/schema.h: Allows column descriptors to use IEEE-ordered min/max statistics.
• cpp/src/parquet/page_index.h: Exposes has_nan_counts() and nan_counts().
• cpp/src/parquet/statistics.h: Adds NaN fields and presence APIs to EncodedStatistics and Statistics, and extends encoded-state Statistics::Make / MakeStatistics overloads with nan_count and has_nan_count.

• GitHub Issue: [C++][Parquet] Add IEEE-754 total order and nan count for floating types #50689

[HuaHuaY]

There are many CI errors. I will fix them tomorrow.

[HuaHuaY]

Add this because I added a PARQUET_DEPRECATED at cpp/src/parquet/statistics.h and ci failed. https://github.com/apache/arrow/actions/runs/30975844655/job/92209544482

I believe this is a long-standing issue. If someone would like me to submit a separate PR to fix it, I can certainly do so.

[wgtmac]

I would suggest directly using std::optional<int64_t> nan_count just like is_max_value_exact and is_min_value_exact.

[HuaHuaY]

I choose to follow the style of null_count and distinct_count. I think there will be many diff changes to modifying them together. If we decide to do this, I recommend putting the changes in a separate PR. However, since it involves changes to a public API, we had better to put the two PRs in the same Arrow release.