add central formatter tool

.tools/typescript_formatter/.prettierignore

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+**/node_modules
+**/dist
+**/src/generated
+*.d.ts

.tools/typescript_formatter/README.md

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+# TypeScript Examples formatter
+
+Use this to format all typescript example files by running
+  - `npm run format-basics`
+  - `npm run format-patterns`
+  - or `npm run format-all`

.tools/typescript_formatter/package.json

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+{
+  "name": "typescript-examples-formatter",
+  "version": "1.0.0",
+  "description": "Formatter for typescript projects",
+  "private": true,
+  "scripts": {
+    "format-basics": "prettier --ignore-path .prettierignore --print-width 100 --write \"./../../basics/**/*.ts\"",
+    "format-patterns": "prettier --ignore-path .prettierignore --print-width 100 --write \"./../../**/patterns-use-cases/**/*.ts\"",
+    "format-all": "npm run format-basics && npm run format-patterns"
+  },
+  "devDependencies": {
+    "prettier": "^2.8.4"
+  }
+}