Rule proposal: consistent-template-literal-escape

### Description

`${` is required to escape in template literal, but there are multiple ways to do

```
`\${`;
`$\{`;
`\$\{`;
```

Let's enforce escape `$`?

### Examples

```js
// ❌
`$\{a}`;

// ❌
`\$\{a}`;

// ✅
`\${a}`;
```


### Proposed rule name

`consistent-template-literal-escape`

### Additional Info

_No response_