added participant shape test

tests/participant/shapes/.gitignore

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+# generated by tytanic, do not edit
+
+diff/**
+out/**

tests/participant/shapes/test.typ

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+#set page(width: auto, height: auto)
+#import "/src/lib.typ": *
+
+
+#let TYPST = image("typst.png", width: 1.5cm, height: 1.5cm, fit: "contain")
+#let FERRIS = image("ferris.png", width: 1.5cm, height: 1.5cm, fit: "contain")
+#let ME = image("me.jpg", width: 1.5cm, height: 1.5cm, fit: "contain")
+
+#diagram({
+  _par("Foo", display-name: "Participant", shape: "participant")
+  _par("Foo1", display-name: "Actor", shape: "actor")
+  _par("Foo2", display-name: "Boundary", shape: "boundary")
+  _par("Foo3", display-name: "Control", shape: "control")
+  _par("Foo4", display-name: "Entity", shape: "entity")
+  _par("Foo5", display-name: "Database", shape: "database")
+  _par("Foo6", display-name: "Collections", shape: "collections")
+  _par("Foo7", display-name: "Queue", shape: "queue")
+  _par("Foo8", display-name: "Typst", shape: "custom", custom-image: TYPST)
+  _par("Foo9", display-name: "Ferris", shape: "custom", custom-image: FERRIS)
+  _par("Foo10", display-name: "Baryhobal", shape: "custom", custom-image: ME)
+})