Make ParquetFileReader.getFilteredRecordCount public

[asfimport]

Please see  apache/spark@4756e67 for more details.

Reporter: Yuming Wang / @wangyum
Assignee: Yuming Wang / @wangyum

Related issues:

• Release parquet 1.11.1 (blocks)

PRs and other links:

• GitHub Pull Request #728

_{Note: This issue was originally created as PARQUET-1740. Please see the migration documentation for further details.}