Showcase how to integrate DB-specific functions (#201)

Augment `AdminService.Author` by 2 fields `age` and `lifetime` whose
values are computed by SQLite and HANA-specific functions.

Don't do this in bookshop directly, to keep it simple.  Instead, use
the fiori module, which also allows to integrate the fields in the UI.

Co-authored-by: Daniel <daniel.hutzel@sap.com>

fiori/db/sqlite/index.cds

@@ -0,0 +1,10 @@
+//
+//  Add Author.age and .lifetime with a DB-specific function
+//
+
+using { AdminService } from '..';
+
+extend projection AdminService.Authors with {
+  strftime('%Y',dateOfDeath)-strftime('%Y',dateOfBirth)              as age: Integer,
+  strftime('%Y',dateOfBirth) || ' – ' || strftime('%Y',dateOfDeath)  as lifetime : String
+}