[SDK] Add exemplar reservoir to async metric storage #8485

Job	Run time
CMake gcc 12 (maintainer mode, async)	10m 2s
CMake gcc 12 (maintainer mode, sync)	10m 44s
CMake test (without otlp-exporter)	3m 57s
CMake clang 14 (maintainer mode, async)	26m 17s
CMake clang 14 (maintainer mode, sync)	16m 30s
CMake msvc (maintainer mode)	10m 1s
CMake test (with abseil)	6m 57s
CMake do not install test (with otlp-exporter)	24m 40s
CMake gcc 4.8 (with otlp exporter)	13m 50s
CMake gcc 4.8 (without otlp exporter)	6m 32s
CMake gcc 12 (maintainer mode, C++11, async)	10m 47s
CMake test (with modern protobuf,grpc and abseil)	31m 17s
CMake test (with opentracing-shim)	7m 17s
CMake test (build shared libraries with otlp-exporter and static gRPC)	18m 56s
CMake test (with otlp-exporter)	16m 30s
CMake C++20 test(GCC)	7m 35s
CMake C++20 test(Clang with libc++)	8m 58s
CMake test (without otlp-exporter and with async export)	4m 16s
Plugin -> CMake	1m 48s
Bazel asan config	9m 5s
Bazel noexcept	17m 56s
Bazel nortti	21m 18s
Bazel on MacOS	8m 59s
Bazel	15m 50s
Bazel with async export	18m 57s
Bazel tsan config	18m 11s
Bazel valgrind	19m 33s
Bazel with external abseil	21m 0s
CMake install test (with abseil)	5m 53s
Benchmark	12m 17s
Code coverage	8m 20s
Copyright	9s
Format	19s
CMake -> exporter proto	15m 53s
Bazel Windows	42m 33s
Plugin -> CMake Windows	9m 30s
CMake (With async export) -> exporter proto	16m 4s
CMake -> exporter proto (Build as DLL)	16m 13s
DocFX check	3m 29s
markdown-lint	10s
misspell	6s
	8h 38m 39s

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