haveged: add page (#16979)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/haveged.md

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+# haveged
+
+> Hardware-based random number generator.
+> More information: <https://manned.org/haveged>.
+
+- Generate a random number:
+
+`sudo haveged`
+
+- Run `haveged` in foreground:
+
+`sudo haveged {{[-F|--Foreground]}}`
+
+- Set file path for output of `haveged`:
+
+`sudo haveged {{[-f|--file]}} {{path/to/file}}`
+
+- Set run level for daemon:
+
+`sudo haveged {{[-r|--run]}} {{runlevel}}`
+
+- Set collection buffer size in kibibyte words:
+
+`sudo haveged {{[-b|--buffer]}} {{buffersizeinKW}}`
+
+- Insert a command to an already running `haveged` process or daemon:
+
+`sudo haveged {{[-c|--command]}} {{command}}`
+
+- Set cache size in kibibyte words:
+
+`sudo haveged {{[-d|--data]}} {{cachesizeinKW}}`
+
+- Set number of bytes to write to the output file:
+
+`sudo haveged {{[-n|--number]}} {{byteamount}}`