Add API coverage for javax.xml.transform.sax.SAX{Result,Source}

API list:
 * javax.xml.transform.sax.SAXResult.SAXResult()
 * javax.xml.transform.sax.SAXResult.SAXResult(org.xml.sax.ContentHandler)
 * javax.xml.transform.sax.SAXResult.getHandler()
 * javax.xml.transform.sax.SAXResult.getLexicalHandler()
 * javax.xml.transform.sax.SAXResult.getSystemId()
 * javax.xml.transform.sax.SAXResult.setHandler(org.xml.sax.ContentHandler)
 * javax.xml.transform.sax.SAXResult.setLexicalHandler(org.xml.sax.ext.LexicalHandler)
 * javax.xml.transform.sax.SAXResult.setSystemId(java.lang.String)
 * javax.xml.transform.sax.SAXSource.SAXSource()
 * javax.xml.transform.sax.SAXSource.SAXSource(org.xml.sax.XMLReader, org.xml.sax.InputSource)
 * javax.xml.transform.sax.SAXSource.setInputSource(org.xml.sax.InputSource)
 * javax.xml.transform.sax.SAXSource.setXMLReader(org.xml.sax.XMLReader)

Bug: 201783323
Test: atest CtsLibcoreTestCases:libcore.javax.xml.transform.sax.SAX{Result,Source}Test
Merged-In: Ie50210413fbcb05d361e5dd125968e2b78dfe4ba
Change-Id: Ie50210413fbcb05d361e5dd125968e2b78dfe4ba
2 files changed