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Make it work with protobuf 4.x and absl library

Reiner Hauser requested to merge protobuf4 into master

Newer protobuf versions use the google absl library. The easiest way to pick up all dependencies is to switch from the FindProtobuf.cmake module (in CMake itself, with a hacked version in the TDAQ cmake/modules directory) to the cmake configuration provided by protobuf itself.

The change from 'Protobuf' to 'protobuf::libprotobuf' bypasses the FindProtobuf.cmake file completely. For older TDAQ release we need the explicit find_package(protobuf REQUIRED CONFIG HINTS ...) while this works out of the box in recent TDAQ versions.

Tested that it builds in work area with tdaq-11-02-01, nightly and dev4 (via offline nightly installation).

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