Returns a list of selected Sheets API v4 endpoints, as stored inside the
googlesheets4 package. The names of this list (or the id
sub-elements) are
the nicknames that can be used to specify an endpoint in
request_generate()
. For each endpoint, we store its nickname or id
, the
associated HTTP method
, the path
, and details about the parameters. This
list is derived programmatically from the Sheets API v4 Discovery
Document (https://www.googleapis.com/discovery/v1/apis/sheets/v4/rest
).