Roster upload

APIs for roster upload file column mappings

📄️Retrieve grouping metadata for tenant system fields

Returns the grouping rules that apply to each of the tenant's system fields, keyed by the field's `mappedKey`.

Matches the raw column headers of an uploaded roster file against a named roster upload template and reports which headers resolve to known fields.

Creates a new roster upload template from a set of confirmed column mappings, or updates an existing one.