BloomFilter and float point is ambiguous

Currently, our Parquet can use BloomFilter for any physical types. However, when BloomFilter apply on float:
1. What does +0 -0 means? Are they equal?
1. Should qNaN sNaN written in BloomFilter? Are they equal?

 

**Reporter**: [Xuwei Fu](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mwish) / @mapleFU

_{**Note**: *This issue was originally created as [PARQUET-2255](https://issues.apache.org/jira/browse/PARQUET-2255). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

No file, test, or entry point is named, so begin by reading the Parquet BloomFilter specification and the five-comment discussion. Define and document how +0/-0 and qNaN/sNaN are treated, including equality and BloomFilter inclusion; done means both ambiguities are resolved in the specification.

Written by the indexing model from the issue text.