Format block of text with specified language

[murdos]

It would be nice if prettier-java could delegate to prettier the formatting of block of text that is commented with language = ....

E.g.

// language = json
String someJson = """
{"glossary":{"title": "example glossary"}}
"""

Expected behavior:

// language = json
String someJson = """
{
    "glossary": { 
        "title": "example glossary",
    }
}
"""

language = <language> is supported by Jetbains IDEs: adding this comment allow syntax highlighting, code completion and verification.

This would be similar to what Prettier does out of the box with block of code inside Mardown such as:

```json
{
  "firstName": "John",
  "lastName": "Smith",
  "age": 25
}