feat(NODE-4520): deprecate callback support and implement wrapper library

Author: nbbeeken

.eslintignore

@@ -2,3 +2,5 @@
 lib
 test/disabled
 !etc/docs
+!*.test-d.ts
+*.d.ts

etc/mongodb-callbacks/.eslintrc.json

@@ -0,0 +1,29 @@
+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": "./etc/mongodb-callbacks/jsconfig.json",
+    "ecmaVersion": 2019
+  },
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "plugins": ["prettier", "@typescript-eslint"],
+  "extends": ["eslint:recommended", "plugin:prettier/recommended"],
+  "rules": {
+    "strict": "error",
+    "prettier/prettier": "error",
+    "no-console": "error",
+    "valid-typeof": "error",
+    "eqeqeq": [
+      "error",
+      "always",
+      {
+        "null": "ignore"
+      }
+    ],
+    "no-implicit-coercion": "error",
+    "@typescript-eslint/strict-boolean-expressions": "error"
+  }
+}

etc/mongodb-callbacks/.gitignore

@@ -0,0 +1 @@
+!mongodb-legacy.d.ts

etc/mongodb-callbacks/.mocharc.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://raw.githubusercontent.com/SchemaStore/schemastore/master/src/schemas/json/mocharc.json",
+  "extension": ["js", "ts"],
+  "recursive": true,
+  "failZero": true,
+  "sort": true,
+  "color": true,
+  "require": [
+    "test/hooks/fake_server.js"
+  ]
+}

etc/mongodb-callbacks/jsconfig.json

@@ -0,0 +1,12 @@
+{
+    "compilerOptions": {
+        "moduleResolution": "node",
+        "target": "es2020",
+        "allowJs": true,
+        "checkJs": true,
+        "strict": false,
+        "strictNullChecks": true,
+        "strictPropertyInitialization": true,
+        "noEmit": true
+    }
+}