add polar plot with error bands

Hi! I have a feature request. It would be nice if the plotly.express polar plot functions would also have error_y / error_y_minus options in order to draw error bands. This would allow users to inspect group differences in a multivariate space quickly. The issue is further described on stackoverflow. The idea would be that each group gets its own trace. For each variable in theta, Samples within each group can be used to estimate the mean and some sort of confidence interval (e.g. SEM).

从 plotly.express 的极坐标图函数开始，并查看链接的 Stack Overflow 示例。确定分组样本应如何生成每个变量的均值和置信区间，包括 error_y 和 error_y_minus 的作用。完成的标准是每个组都能渲染自己的带误差带的极坐标 trace，并且该行为有适当的测试覆盖。