Read pixel physical size from HuBMAP metadata

[mruffalo]

The HuBMAP MIBI metadata spec contains the physical size for pixels, in the fields

• resolution_x_value
• resolution_x_unit and similar for dimension y.

Read these physical sizes from HuBMAP *metadata.tsv files, and embed this information in the appropriate OME-XML attributes when writing OME-TIFF output files.

[mruffalo]

The Salmon RNA-seq pipeline has functionality for (optionally) reading HuBMAP metadata files, as in https://github.com/hubmapconsortium/salmon-rnaseq/blob/main/bin/salmon/salmon_wrapper.py#L43 and https://github.com/hubmapconsortium/salmon-rnaseq/blob/main/bin/salmon/salmon_wrapper.py#L66. The regex at https://github.com/hubmapconsortium/salmon-rnaseq/blob/main/bin/salmon/salmon_wrapper.py#L38 probably needs to be loosened a bit, likely to match something like (.*)metadata.tsv$.

[seschultz]

Updated collect_dataset_info.py, collect_output.py, and utils_ome.py to do this