Support keyof operator keyword

[kunli2]

An example test

    @Test
    void keyofKeyword() {
        rewriteRun(
          javaScript(
            """
              type Person = { name: string , age: number };
              type KeysOfPerson = keyof Person;
              """
          )
        );
    }

[knutwannheden]

Documentation link: https://www.typescriptlang.org/docs/handbook/2/keyof-types.html

Possibly we can also add links to the corresponding lines of the "official" parser.