[SDK] Add exemplar reservoir to async metric storage #8484

Job	Run time
CMake test (without otlp-exporter)	5m 45s
CMake gcc 12 (maintainer mode, async)	14m 39s
CMake clang 14 (maintainer mode, sync)	16m 12s
CMake gcc 12 (maintainer mode, C++11, async)	9m 54s
CMake gcc 12 (maintainer mode, sync)	10m 17s
CMake msvc (maintainer mode)	10m 38s
CMake test (with abseil)	7m 4s
CMake clang 14 (maintainer mode, async)	21m 20s
CMake gcc 4.8 (with otlp exporter)	12m 5s
CMake gcc 4.8 (without otlp exporter)	4m 52s
CMake test (with opentracing-shim)	6m 27s
CMake C++20 test(Clang with libc++)	6m 9s
CMake test (without otlp-exporter and with async export)	6m 26s
CMake C++20 test(GCC)	6m 13s
Bazel	15m 16s
Bazel with async export	17m 20s
CMake do not install test (with otlp-exporter)	19m 38s
CMake install test (with abseil)	6m 49s
CMake test (with modern protobuf,grpc and abseil)	26m 31s
CMake test (build shared libraries with otlp-exporter and static gRPC)	23m 58s
CMake test (with otlp-exporter)	20m 34s
Plugin -> CMake	1m 15s
Bazel asan config	10m 49s
Bazel noexcept	22m 40s
Bazel nortti	15m 55s
Bazel on MacOS	27m 13s
Bazel tsan config	23m 25s
Bazel valgrind	21m 59s
Bazel with external abseil	25m 19s
Benchmark	12m 19s
Copyright	9s
Format	17s
CMake -> exporter proto	15m 59s
CMake -> exporter proto (Build as DLL)	16m 15s
Code coverage	9m 41s
DocFX check	1m 21s
markdown-lint	9s
misspell	7s
Bazel Windows	35m 50s
Plugin -> CMake Windows	9m 35s
CMake (With async export) -> exporter proto	17m 17s
	8h 55m 41s

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