Feaure request: Ability to defer manipulations and generate TextChange[] or FileTextChanges[]

**Is your feature request related to a problem? Please describe.**

I'm writing a script that automatically add JSDoc for more than 1k enum members in a single file.
It takes more than 15 seconds to `addJSDoc` for every enum members. And editing the structure cannot preserve the indentation.

**Describe the solution you'd like**

Add a method such as:
```typescript
const textChanges = sourceFile.defered(() => {
for (const enumMember of enumNode.getMembers()) {
enumMember.addJsDoc('balabala');
}
});
sourceFile.applyTextChanges(textChanges);
```

**Describe alternatives you've considered**

Manually generate TextChange objects, and then apply them, which will only cost about 300ms, much less than 15000ms+!