[P4Testgen] Move common code of BMv2 test back ends into a common class. #4220
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This is the second PR of a series of three to refactor the BMv2 test back ends.
This PR moves code that is common to the increasing amount of test back ends into a
common
class. This makes it easier to add new test back ends to the BMv2 P4Testgen extension.It also renables the BMv2 Protobuf back end and updates its Xfails.