added note tests

tests/note/color/.gitignore

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

tests/note/color/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")
+
+  _note("left", [This is displayed\ left of Alice.], pos: "a", color: rgb("#00FFFF"))
+  _note("right", [This is displayed right of Alice.], pos: "a")
+  _note("over", [This is displayed over Alice.], pos: "a")
+  _note("over", [This is displayed\ over Bob and Alice.], pos: ("a", "b"), color: rgb("#FFAAAA"))
+  _note("over", [This is yet another\ example of\ a long note.], pos: ("a", "b"))
+})