chore(format): add prettier config with 80-char printWidth

.prettierignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+build
+*.min.js
+**/*.gen.ts
+internal/replay/dist
+replay-ui/dist

.prettierrc.json

@@ -0,0 +1,3 @@
+{
+  "printWidth": 80
+}