Sunburst plots override font size and don't position unreadable labels outside

Hi everyone,

just discovered sunburst plots and am loving them! Besides the problem of text orientation that is momentarily being solved, I am wondering why it is possible to style outsidetextfont but not possible to actually place text outside the chart (at least for the last level). Similarly to pie charts, I would expect to find a textposition = 'outside' parameter. At the moment, for tiny wedges, the labels are being squeezed in no matter what, ignoring the font sizes given in insidetextfont AND textfont. Example:

import plotly.graph_objects as go
data = pd.DataFrame.from_dict({'key': {0: '#iii',
  1: '#vi',
  2: 'I',
  3: 'III',
  4: 'V',
  5: 'bII',
  6: 'i',
  7: 'ii',
  8: 'iii',
  9: 'iv',
  10: 'v',
  11: 'major',
  12: 'minor'},
 'duration': {0: 4.0,
  1: 12.0,
  2: 85.0,
  3: 202.0,
  4: 4.0,
  5: 4.5,
  6: 655.0,
  7: 5.0,
  8: 4.0,
  9: 33.5,
  10: 54.5,
  11: 295.5,
  12: 768.0},
 'parent': {0: 'minor',
  1: 'minor',
  2: 'major',
  3: 'major',
  4: 'major',
  5: 'major',
  6: 'minor',
  7: 'minor',
  8: 'minor',
  9: 'minor',
  10: 'minor',
  11: '',
  12: ''}})
fig =go.Figure(go.Sunburst(
    labels=data.key,
    parents=data.parent,
    values=data.duration,
    branchvalues="total", 
    textfont = {'size': 20},
    insidetextfont = {'size': 20},
    textinfo = "label+percent parent",
    #textposition='outside' <-- this option is missing
    ))
fig.show()

Start by running the provided Python reproduction with go.Sunburst and compare its label placement and font-size behavior with the pie-chart behavior mentioned in the issue. Trace the sunburst label options and determine the expected behavior for outside placement, tiny wedges, and textfont/insidetextfont; done means the requested option and sizing behavior work in the reported example.