Search for omics assay types and its availability status.
Value
A data frame with assay types and their availability status.
There are two availability status:
"Available" means the assay type currently exists in the database,
and users can upload signatures or collections that are specifically
associated with this assay type.
"Unavailable" means the assay type isn't existed in the database yet,
and users cannot upload signatures or collections that are specifically
associated with this assay type.
