Add test of server builder, including channel args

Makefile

build.yaml

src/cpp/server/server_builder.cc

src/cpp/server/server_cc.cc

test/cpp/server/server_builder_test.cc

tools/run_tests/generated/sources_and_headers.json

tools/run_tests/generated/tests.json

...proj/test/server_builder_test/server_builder_test.vcxproj

...t/server_builder_test/server_builder_test.vcxproj.filters