Provide a code action to replace a string with a template string

Suggestion

Provide a code action on a string to replace the string with a template string.

Use Cases

Often you start with a normal string and notice that it should better be a template string. See the example below. When the cursor is inside the string, there should be code action provided 'Replace with template string'

The code action replace the string with a template string

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

issue 中没有指定实现文件或测试。首先定位 TypeScript 现有的 code-action 入口点和测试，然后使用提供的普通字符串示例作为输入用例。当普通字符串中的光标能够提供“Replace with template string”并应用转换，且不改变运行时行为时，即视为完成。