ENH: Add test for extended extern C interface

Integration tests for https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/411 and caosdb-cpplib!8 (merged)

Use a server in f-grpc-dev for the integration tests (e.g. caosdb-deploy in f-grpc with empty profile).

test/CMakeLists.txt

@@ -82,7 +82,7 @@ if(LINTING)
             "--warnings-as-errors=*"
             "--fix")
         set(_CMAKE_CXX_CLANG_TIDY_CHECKS
-          "--checks=*,-fuchsia-*,-llvmlibc-*,-cert-err58-cpp,-cppcoreguidelines-avoid-non-const-global-variables,-cppcoreguidelines-owning-memory,-modernize-use-trailing-return-type,-google-readability-avoid-underscore-in-googletest-name,-cppcoreguidelines-avoid-magic-numbers,-readability-magic-numbers,-cppcoreguidelines-avoid-goto,-hicpp-avoid-goto,-readability-function-cognitive-complexity")
+          "--checks=*,-fuchsia-*,-llvmlibc-*,-cert-err58-cpp,-cppcoreguidelines-avoid-non-const-global-variables,-cppcoreguidelines-owning-memory,-modernize-use-trailing-return-type,-google-readability-avoid-underscore-in-googletest-name,-cppcoreguidelines-avoid-magic-numbers,-readability-magic-numbers,-cppcoreguidelines-avoid-goto,-hicpp-avoid-goto,-readability-function-cognitive-complexity,-cppcoreguidelines-pro-type-vararg,-cppcoreguidelines-pro-bounds-array-to-pointer-decay,-hicpp-no-array-decay")
     endif()
 else()
     message(STATUS "LINTING is OFF")