Add stress testing framework, with basic metrics example to demonstrate. #10987

Job	Run time
CMake test (with abseil)	5m 21s
CMake clang 18 (maintainer mode, abiv2)	9m 42s
CMake clang 18 (maintainer mode, async)	9m 37s
CMake clang 18 (maintainer mode, sync)	10m 7s
CMake gcc 14 (maintainer mode, async)	7m 44s
CMake gcc 14 (maintainer mode, sync)	7m 43s
CMake msvc (maintainer mode)	8m 37s
CMake msvc (maintainer mode) with C++20	9m 56s
CMake test (with opentracing-shim)	4m 16s
CMake test (with otlp-exporter)	15m 30s
CMake test (without otlp-exporter)	5m 55s
CMake C++14 test(GCC)	5m 7s
CMake C++17 test(GCC)	5m 43s
CMake C++20 test(Clang with libc++)	9m 51s
CMake C++20 test(GCC)	14m 32s
CMake C++23 test(Clang with libc++)	10m 24s
CMake C++23 test(GCC)	9m 28s
CMake test (without otlp-exporter and with async export)	6m 0s
Bazel asan config	21m 30s
Bazel without bzlmod	17m 1s
Bazel noexcept	17m 24s
Bazel nortti	19m 37s
Bazel on MacOS	14m 6s
Bazel	19m 58s
Bazel with async export	17m 46s
Bazel tsan config	18m 32s
Bazel valgrind	20m 36s
Benchmark	14m 19s
CMake do not install test (with otlp-exporter)	15m 37s
CMake install test (with abseil)	5m 48s
CMake test (with modern protobuf,grpc and abseil)	17m 16s
CMake test (build shared libraries with otlp-exporter and static gRPC)	14m 50s
Code coverage	13m 1s
Copyright	8s
Format	28s
markdown-lint	6s
Plugin -> CMake	2m 59s
CMake -> exporter proto	13m 49s
Bazel Windows	33m 52s
Plugin -> CMake Windows	7m 23s
CMake (With async export) -> exporter proto	13m 41s
CMake -> exporter proto (Build as DLL)	31m 48s
DocFX check	51s
misspell	4s
shellcheck	6s
W3C Distributed Tracing Validation V1	4m 25s
	8h 32m 34s

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