[EXPORTER] Implement in-memory metric exporter #10132

Job	Run time
CMake test arm64 (with modern protobuf,grpc and abseil)	16m 31s
CMake clang 18 (maintainer mode, abiv2)	7m 30s
CMake clang 18 (maintainer mode, async)	7m 38s
CMake clang 18 (maintainer mode, sync)	8m 0s
CMake gcc 14 (maintainer mode, sync)	11m 28s
CMake gcc 14 (maintainer mode, async)	11m 20s
CMake test (without otlp-exporter)	2m 18s
CMake test (with abseil)	2m 50s
CMake msvc (maintainer mode)	6m 53s
CMake msvc (maintainer mode) with C++20	8m 0s
CMake test (with opentracing-shim)	2m 48s
CMake C++14 test(GCC)	4m 14s
CMake C++17 test(GCC)	4m 45s
CMake test (without otlp-exporter and with async export)	1m 49s
CMake do not install test (with otlp-exporter)	10m 48s
CMake test (with modern protobuf,grpc and abseil)	15m 2s
CMake test (build shared libraries with otlp-exporter and static gRPC)	11m 11s
CMake test (with otlp-exporter)	10m 43s
CMake C++20 test(Clang with libc++)	4m 32s
CMake C++20 test(GCC)	4m 29s
CMake C++23 test(Clang with libc++)	4m 24s
CMake C++23 test(GCC)	4m 42s
Bazel asan config	1m 56s
Bazel without bzlmod	5m 24s
Bazel noexcept	2m 19s
Bazel nortti	3m 10s
Bazel	2m 31s
Bazel with async export	2m 27s
Bazel valgrind	59s
CMake install test (with abseil)	2m 53s
Plugin -> CMake	1m 9s
Bazel on MacOS	11m 26s
Bazel tsan config	6m 13s
Benchmark	12m 42s
Code coverage	7m 39s
Copyright	7s
DocFX check	45s
Format	18s
markdown-lint	16s
misspell	7s
shellcheck	7s
CMake -> exporter proto	10m 4s
Bazel Windows	8m 39s
CMake (With async export) -> exporter proto	9m 59s
Plugin -> CMake Windows	6m 49s
CMake -> exporter proto (Build as DLL)	14m 57s
	4h 34m 51s

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