Embed files into XSSF sheets in Excel, using Apache POI

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I’ve applied a patch via #60586, so embedding is now much easier. The following snipplet is taken from the corresponding JUnit test.

Workbook wb1 = new XSSFWorkbook();
Sheet sh = wb1.createSheet();
int picIdx = wb1.addPicture(getSamplePng(), Workbook.PICTURE_TYPE_PNG);
byte samplePPTX[] = getSamplePPT(true);
int oleIdx = wb1.addOlePackage(samplePPTX, "dummy.pptx", "dummy.pptx", "dummy.pptx");

Drawing<?> pat = sh.createDrawingPatriarch();
ClientAnchor anchor = pat.createAnchor(0, 0, 0, 0, 1, 1, 3, 6);
pat.createObjectData(anchor, oleIdx, picIdx);

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