feat(core): add automatic migration from Renderer to Renderer2 (#30936)

Adds a schematic and tslint rule that automatically migrate the consumer from `Renderer` to `Renderer2`. Supports:
* Renaming imports.
* Renaming property and method argument types.
* Casting to `Renderer`.
* Mapping all of the methods from the `Renderer` to `Renderer2`.

Note that some of the `Renderer` methods don't map cleanly between renderers. In these cases the migration adds a helper function at the bottom of the file which ensures that we generate valid code with the same return value as before. E.g. here's what the migration for `createText` looks like.

Before:
```
class SomeComponent {
  createAndAddText() {
    const node = this._renderer.createText(this._element.nativeElement, 'hello');
    node.textContent += ' world';
  }
}
```

After:
```
class SomeComponent {
  createAndAddText() {
    const node = __rendererCreateTextHelper(this._renderer, this._element.nativeElement, 'hello');
    node.textContent += ' world';
  }
}

function __rendererCreateTextHelper(renderer: any, parent: any, value: any) {
  const node = renderer.createText(value);
  if (parent) {
    renderer.appendChild(parent, node);
  }
  return node;
}
```

This PR resolves FW-1344.

PR Close #30936

packages/core/schematics/migrations/renderer-to-renderer2/README.md

@@ -0,0 +1,33 @@
+## Renderer -> Renderer2 migration
+
+Automatically migrates from `Renderer` to `Renderer2` by changing method calls, renaming imports
+and renaming types. Tries to either map method calls directly from one renderer to the other, or
+if that's not possible, inserts custom helper functions at the bottom of the file.
+
+#### Before
+```ts
+import { Renderer, ElementRef } from '@angular/core';
+
+@Component({})
+export class MyComponent {
+  constructor(private _renderer: Renderer, private _elementRef: ElementRef) {}
+
+  changeColor() {
+    this._renderer.setElementStyle(this._element.nativeElement, 'color', 'purple');
+  }
+}
+```
+
+#### After
+```ts
+import { Renderer2, ElementRef } from '@angular/core';
+
+@Component({})
+export class MyComponent {
+  constructor(private _renderer: Renderer2, private _elementRef: ElementRef) {}
+
+  changeColor() {
+    this._renderer.setStyle(this._element.nativeElement, 'color', 'purple');
+  }
+}
+```