🔧(compilation) setup tsconfig package

Add a shared package for tsconfigs splitted between node and frontend concerns
to centralize our standards.

packages/tsconfig/README.md

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+# `tsconfig`
+
+These are base shared `tsconfig.json`s from which all other `tsconfig.json`'s inherit from.

packages/tsconfig/base.json

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+{
+  "compilerOptions": {
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "es6",
+      "scripthost",
+      "es2015",
+      "es2016",
+      "es2017",
+      "es2021.string",
+      "esnext.intl"
+    ],
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "strict": true
+  },
+  "include": ["./**/*"]
+}

packages/tsconfig/node.json

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+{
+  "extends": "./base.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es2017",
+    "sourceMap": true,
+    "allowJs": true
+  }
+}

packages/tsconfig/package.json

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+{
+  "name": "@openfun/typescript-configs",
+  "version": "0.0.0",
+  "private": true
+}

packages/tsconfig/react.json

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+{
+  "extends": "./base.json",
+  "compilerOptions": {
+    "jsx": "react",
+    "module": "esnext",
+    "sourceMap": true,
+    "target": "es6"
+  }
+}