core: & with some selectors produces an invalid result

[layershifter]

Comes from #178.

Griffel handles classes & pseudo classes selectors properly, for example:

 makeStyles({
  root: {
    '&.foo': { color: 'red' }
  },
});

Produces correct result ✅

.f1lw17ff.foo {
  color: red;
}

---

While &body:

makeStyles({
  root: {
    '&body': { color: 'red' }
  },
})

Produces a wrong result 🚨

.f115m9dlbody { /* 🤯 oops */
  color: red;
}

• [ ] check also [data] selectors