working with vastropy.io.votable

Both [DataOrigin](https://www.ivoa.net/documents/DataOrigin/) and [mivot](https://www.ivoa.net/documents/MIVOT/) require to access VOTable fragments which are not available in `astropy.table.Table`.

DataOrigin is available in the [data_origin module of astropy]( https://docs.astropy.org/en/stable/api/astropy.io.votable.dataorigin.DataOrigin.html). and mivot is available in the [MivotBlock module](https://docs.astropy.org/en/stable/api/astropy.io.votable.tree.MivotBlock.html)

However, astroquery (for instance astroquery.Vizier) can't access these votable fragments.

For instance: (VizieR example, but it is the same with other Services)

```
>>> from astroquery.vizier import Vizier
>>> vizier = Vizier()
>>>exoplanets_star = vizier.get_catalogs("J/ApJ/788/39")[0]
>>>type(exoplanets_star)

```

Start by reproducing the VizieR example through astroquery.Vizier and inspect how the result becomes an astropy.table.Table. Read the referenced astropy.io.votable.dataorigin.DataOrigin and astropy.io.votable.tree.MivotBlock modules to determine what fragments are lost. Done means astroquery results expose the required VOTable fragments, with tests covering the behavior.

Written by the indexing model from the issue text.