Related work items: #584772

Rustam Lotsmanenko (EPAM) authored Nov 23, 2020 and Rostislav Dublin (EPAM) committed Nov 23, 2020

Changes:
*Added request authentication incoming from Http cloud task
based on token verification
*Updated core-lib-gcp version in pom
*Added property with service acc mail, for token validation
*Updated google-cloud-datastore lib version , to reuse it's Oauth2 dependencies