feat: Map shortcut O to ellipse and Add eraser shortcut E (#4930)

* feat: Add erase shortcut Shift+E

* map o to ellipse and E to Eraser

* fix tests

* use key

* move eraser to tools and rename shape to tools

src/tests/regressionTests.test.tsx

@@ -135,7 +135,7 @@ describe("regression tests", () => {
   for (const [keys, shape, shouldSelect] of [
     [`2${KEYS.R}`, "rectangle", true],
     [`3${KEYS.D}`, "diamond", true],
-    [`4${KEYS.E}`, "ellipse", true],
+    [`4${KEYS.O}`, "ellipse", true],
     [`5${KEYS.A}`, "arrow", true],
     [`6${KEYS.L}`, "line", true],
     [`7${KEYS.X}`, "freedraw", false],