Includes three functions related to custom definitions (i.e. custom dimensions/metrics). The functions write custom definitions to a sheet, list the custom definitions in a entity object, and retrieves the custom definitions from the sheet.
Includes three functions related to custom definitions (i.e. custom dimensions/metrics). The functions write custom definitions to a sheet, list the custom definitions in a entity object, and retrieves the custom definitions from the sheet.

Change-Id: Iaa90dc0d8d3dda4fc18a28673cb4f02d10ee991d

google/ga4-gtm-migration