Prepare ETS config for core metadata validation

[DajanaSnopkova]

Define a few mandatory items (e.g. author, title) to filter records that will be displayed in the Catalog.

DoD:

• core profile is defined - list of required items is known
• core profile is available for validation in admin Hale console

[BerkvensNick]

not yet defined @pvgenuchten , @DajanaSnopkova, @tomreznik. When defined send to @thorsten-reitz for configuration