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()

首先使用 go.Sunburst 运行提供的 Python 复现代码，并将其标签放置和字体大小行为与 issue 中提到的 pie-chart 行为进行比较。跟踪 sunburst 标签选项，并确定对于放置在外部、很小的扇区以及 textfont/insidetextfont 的预期行为；当请求的选项和大小调整行为在报告的示例中正常工作时，即表示完成。