Add v2 meta/metadata_sample_list to API
Add v2 meta/metadata_sample_list to API

Ports this over to the v2 of the metadata API. This will be key for cohort creation and saving. The structure of the returned object has changed fairly significantly as this only get the list of sample barcodes and the study it is associated with (or none if it is TCGA)

TODO: Add filtering based on original cohort id

isb-cgc/ISB-CGC-Webapp,isb-cgc/ISB-CGC-Webapp,isb-cgc/ISB-CGC-Webapp,isb-cgc/ISB-CGC-Webapp