[BEAM-2828, BEAM-2750] Introduces FileIO.read() and uses it in Text, Avro and Xml #3799
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This is on top of #3759.
ReadableFiletype that's just a utility wrapper over aMetadataandCompression.FileIO.read()that returnsReadableFile's - this subsumes BEAM-2750.readFiles()in TextIO and XmlIO that give access to all the features ofFileIOto all users of these IOs. For example, XmlIO does not explicitly support watching for new files, or value providers - but you can get them by combiningFileIO.match,FileIO.read, andXmlIO.readFiles.R: @reuvenlax