ipptool: add page (#12043)

pages/common/ipptool.md

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+# ipptool
+
+> Issue IPP requests and receive printer's/server's responses.
+> See also: `ippfind`, `ippeveprinter`.
+> More information: <https://openprinting.github.io/cups/doc/man-ipptool.html>.
+
+- Get all attributes and their values supported by a printer:
+
+`ipptool ipp://{{printer_uri}} get-completed-jobs.test`
+
+- Get the list of completed jobs of a printer:
+
+`ipptool ipp://{{printer_uri}} get-completed-jobs.test`
+
+- Send an email notification when a printer changes:
+
+`ipptool -d recipient=mailto:{{email}} ipp://{{printer_uri}} create-printer-subscription.test`