feat: Orthogonal (elbow) arrows for diagramming (#8299)

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/excalidraw/locales/en.json

@@ -46,6 +46,10 @@
     "arrowhead_triangle_outline": "Triangle (outline)",
     "arrowhead_diamond": "Diamond",
     "arrowhead_diamond_outline": "Diamond (outline)",
+    "arrowtypes": "Arrow type",
+    "arrowtype_sharp": "Sharp arrow",
+    "arrowtype_round": "Curved arrow",
+    "arrowtype_elbowed": "Elbow arrow",
     "fontSize": "Font size",
     "fontFamily": "Font family",
     "addWatermark": "Add \"Made with Excalidraw\"",
@@ -295,6 +299,7 @@
   "hints": {
     "canvasPanning": "To move canvas, hold mouse wheel or spacebar while dragging, or use the hand tool",
     "linearElement": "Click to start multiple points, drag for single line",
+    "arrowTool": "Click to start multiple points, drag for single line. Press {{arrowShortcut}} again to change arrow type.",
     "freeDraw": "Click and drag, release when you're finished",
     "text": "Tip: you can also add text by double-clicking anywhere with the selection tool",
     "embeddable": "Click-drag to create a website embed",