PayloadQueryParser addition [LUCENE-2997]

I recently needed to deploy payloads for my search system and ran into a small wall: there was no query parser available for use with Payloads. I through this one together, extending out of the new modular QueryParser structure.

Attached is the class file. I didn't know what package this would belong in (whether with the query parser or with the rest of the payload functionality in contrib/analyzers), so it's in the default package for now.

I know this is a little, simple thing, but it seemed like something that should probably be included.

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Migrated from [LUCENE-2997](https://issues.apache.org/jira/browse/LUCENE-2997) by Edward Drapkin, 1 vote, updated Jun 23 2017
Environment:
```
n/a
```

Attachments: [PayloadQueryParser.java](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-2997/PayloadQueryParser.java)