systemd-id128: add page (#11514)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/systemd-id128.md

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+# systemd-id128
+
+> Generate and print sd-128 identifiers.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemd-id128.html>.
+
+- Generate a new random identifier:
+
+`systemd-id128 new`
+
+- Print the identifier of the current machine:
+
+`systemd-id128 machine-id`
+
+- Print the identifier of the current boot:
+
+`systemd-id128 boot-id`
+
+- Print the identifier of the current service invocation (this is available in systemd services):
+
+`systemd-id128 invocation-id`
+
+- Generate a new random identifier and print it as an UUID (five groups of digits separated by hyphens):
+
+`systemd-id128 new --uuid`