ENH: Requested IO readers/writers

[jbrockmendel]

This is roundup issue to keep track of requested IO reader/writer formats. If/when someone wants to implement a particular reader/writer, comment on the appropriate issue and we can re-open the discussion there.

• ENH: Add a Parser to read fixed-width ASCII data using a data description file or dictionary file #7030 read fixed-width ASCII data using a data description file or dictionary file
• CLN: Refactor *SON RFC #9166 *SON RFC
• New data format: ROOT files #9378 ROOT files
• Explore use of ReadStat for binary format read/write #10517 ReadStat for binary format read/write
• ENH: avro to/from serialization #11752 avro
• ENH: Construct dataframe from shell command #16846 shell command
• read_docx? #22518 read_docx
• Can provide read_elastic and to_elastic support for dataframes using maybe elasticsearch-py? #23315 read_elastic/to_elastic using elasticsearch-py
• ENH: to_xml, read_xml #27554 XML
• GraphQL support / accessor plugin system #29076 GraphQL
• ENH: IO support for R data files with pandas.read_rdata and DataFrame.to_rdata #40287 R
• ENH: Add to_tf_dataset method to convert Pandas dataframe to TensorFlow dataset #48524 tensorflow
• ENH: Add support to read and write Amazon ION files #55725 Amazon ION
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