gRPC is currently getting formatted with two different clang-format implementations, and due to some weirdness they have different include file orderings. This change introduces clang-format configuration to ensure that the two systems align - it's *highly* expected that this will need some maintenance going forward as the two systems evolve.
Closes#40905
PiperOrigin-RevId: 819606209
CMake needs following two changes which were missed part from https://github.com/grpc/grpc/pull/37919 to make CMake use C++17.
- **Explicitly require C++17 for gRPC targets using `cxx_std_17`**: This ensures that gRPC build targets are built with the correct C++17 support.
- **Enforce C++17 for all CMake invocations using `CMAKE_CXX_STANDARD=17`**: This is necessary due to Abseil's API changes depending on the C++ standard used. (e.g. Abseil's `absl::string_view` is implemented differently depending on the C++ standard. Before C++17, it's a distinct type. From C++17 onwards, it's simply an alias for `std::string_view`.) To maintain consistency and avoid build errors, all CMake builds (except particular build tests targetting C++20 or C++23) are now configured to use C++17.
The requirement of C++17 for building gRPC should be documented in the release notes and build instructions.
Closes#38335
PiperOrigin-RevId: 712926964
Public Changes -
* Add a pkgconfig installer for `grpcpp_otel_plugin`
Example Changes -
* Add example of how to use the pkgconfig for `grpcpp_otel_plugin` with the existing OpenTelemetry example.
* Add another OpenTelemetry example that uses OTel's OStream exporter. This makes it easier to test the pkgconfig file for `grpcpp_otel_plugin` since the OStream exporter does not require any additional dependencies, as opposed to the Prometheus exporter.
Test changes -
* Modify `run_distrib_test_cmake_pkgconfig.sh` test to install opentelemetry and build the example with the OStream exporter.
Closes#36686
PiperOrigin-RevId: 636965475
Changes -
* Add CMake build support to `grpcpp_otel_plugin`. Currently, we are only supporting the `find_package CONFIG` method for depending on `opentelemetry-cpp`.
* Since, `grpcpp_otel_plugin` is an extension of gRPC, it will not be built by default. To enable building of this target, a new CMake option `gRPC_BUILD_GRPCPP_OTEL_PLUGIN` is being added.
* Also add `CMakeLists.txt` to the otel example.
The `otel_plugin_test` can also be built through cmake but, for the CI to work, there are some additional changes. Those will be made in an upcoming PR.
Closes#36063
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36063 from yashykt:OTelCMakeSupport 3bc783823b17ed282ae9b6b7bf8a26cedaae30f9
PiperOrigin-RevId: 613734473
