chore: allow for callback => promise deprecation (#15758)

* chore: allow for callback => promise deprecation

* cb type check is sufficient

* migrate warn to always trigger

lib/common/api/deprecate.js

@@ -67,6 +67,25 @@ const deprecate = {
     })
   },
 
+  promisify: (promise, cb) => {
+    const oldName = `${promise.name} with callbacks`
+    const newName = `${promise.name} with Promises`
+    const warn = warnOnce(oldName, newName)
+
+    if (typeof cb !== 'function') return promise
+    warn()
+    return promise
+      .then(res => {
+        process.nextTick(() => {
+          cb(null, res)
+        })
+      }, err => {
+        process.nextTick(() => {
+          cb(err)
+        })
+      })
+  },
+
   renameProperty: (o, oldName, newName) => {
     const warn = warnOnce(oldName, newName)