Replace test framework: jest -> vitest (#281)

* Replace test framework: jest -> vitest

* nit - remove deprecated npm scripts

* Add vitest config

* Add a few basic tests

* Update actions with vitest params

* Add correct expectations

* Remove jest config

test/litegraph.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect } from "vitest"
+import { clamp, LGraphCanvas, LiteGraph } from "@/litegraph"
+import { LiteGraphGlobal } from "@/LiteGraphGlobal"
+import { lgTest } from "./lgTest"
+
+describe.concurrent("Litegraph module", () => {
+  lgTest("contains a global export", ({ expect }) => {
+    expect(LiteGraph).toBeInstanceOf(LiteGraphGlobal)
+    expect(LiteGraph.LGraphCanvas).toBe(LGraphCanvas)
+  })
+
+  lgTest("has the same structure", ({ expect }) => {
+    const lgGlobal = new LiteGraphGlobal()
+    expect(lgGlobal).toMatchSnapshot("minLGraph")
+  })
+
+  lgTest("clamps values", () => {
+    expect(clamp(-1.124, 13, 24)).toStrictEqual(13)
+    expect(clamp(Infinity, 18, 29)).toStrictEqual(29)
+  })
+})