added tests for lifelines

tests/lifeline/style/.gitignore

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

tests/lifeline/style/test.typ

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+#set page(width: auto, height: auto)
+#import "/src/lib.typ": *
+
+#diagram({
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _seq("a", "b", enable-dst: true)
+  _seq("a", "b", enable-dst: true, lifeline-style: (fill: red))
+  _gap()
+  _seq("b", "a", disable-src: true)
+  _seq("a", "b", enable-dst: true, lifeline-style: (
+    stroke: (
+      paint: green,
+      dash: "dashed",
+      thickness: 2pt
+    )
+  ))
+  _gap()
+  _seq("b", "a", disable-src: true)
+  _seq("b", "a", disable-src: true)
+  _seq("a", "b", enable-dst: true, lifeline-style: (
+    radius: 4pt
+  ))
+  _gap()
+  _seq("b", "a", disable-src: true)
+})