Mock datasets for MPoL tutorials and tests

`*.npz` and `*.asdf` files containing visibilities are in the TMS format (opposite that of CASA). logo_cube.noise.npz visibilities have been rescaled such that data - model / sigma follows the expected Gaussian envelope. HD 143006 continuum visibilities have flagged outliers removed and weights rescaled such that the data - model / sigma follows the expected Gaussian envelope, for each spectral window. AS 209 continuum visibilities have been averaged across frequency and have their weights rescaled such that the data - model / sigma follows the expected Gaussian envelope, for each spectral window.包含可见度数据的`*.npz`与`*.asdf`文件均采用TMS格式（与CASA格式截然相反）。其中`logo_cube.noise.npz`的可见度数据已完成重缩放处理，使得`(data - model) / sigma`符合预期的高斯分布包络。HD 143006的连续谱可见度数据已剔除已标记的异常值并重新校准权重，使得每个频谱窗口下的`(data - model) / sigma`均匹配预期的高斯分布包络。AS 209的连续谱可见度数据已在频率维度上进行平均，并重新调整权重，使得每个频谱窗口下的`(data - model) / sigma`均符合预期的高斯分布包络。