Add PrimeVueStyled and PrimeVueUnstyled plugins

[mertsincan]

Use PrimeVueStyled plugin for styled mode, and PrimeVueUnstyled plugin for unstyled mode.

Setup on v4

// styled mode
import PrimeVueStyled from 'primevue/styled';

app.use(PrimeVueStyled, {...})

// unstyled mode
import PrimeVueUnstyled from 'primevue/unstyled';

app.use(PrimeVueUnstyled, {...})