[Exporter] Group spans by resource and instrumentation scope in OTLP export requests #8569

Job	Run time
CMake gcc 12 (maintainer mode, async)	13m 38s
CMake gcc 12 (maintainer mode, sync)	10m 10s
CMake gcc 12 (maintainer mode, C++11, async)	10m 37s
CMake test (without otlp-exporter)	8m 57s
CMake test (with abseil)	10m 2s
CMake clang 14 (maintainer mode, async)	16m 36s
CMake clang 14 (maintainer mode, sync)	24m 37s
CMake gcc 4.8 (with otlp exporter)	15m 24s
CMake gcc 4.8 (without otlp exporter)	7m 16s
CMake test (with modern protobuf,grpc and abseil)	28m 51s
CMake msvc (maintainer mode)	15m 36s
CMake test (with opentracing-shim)	6m 22s
CMake test (with otlp-exporter)	21m 33s
CMake C++20 test(Clang with libc++)	16m 23s
CMake C++20 test(GCC)	12m 8s
Bazel asan config	15m 17s
CMake test (without otlp-exporter and with async export)	6m 56s
Bazel noexcept	19m 14s
Bazel nortti	27m 8s
Bazel on MacOS	25m 47s
Bazel	21m 43s
Bazel with async export	20m 15s
Bazel tsan config	19m 58s
Bazel valgrind	22m 59s
Bazel with external abseil	19m 10s
Benchmark	14m 48s
CMake do not install test (with otlp-exporter)	27m 11s
CMake install test (with abseil)	6m 44s
CMake test (build shared libraries with otlp-exporter and static gRPC)	29m 48s
Copyright	7s
Format	18s
Plugin -> CMake	1m 17s
CMake -> exporter proto	17m 29s
Code coverage	12m 56s
DocFX check	1m 19s
markdown-lint	6s
misspell	9s
Bazel Windows	34m 47s
Plugin -> CMake Windows	12m 7s
CMake (With async export) -> exporter proto	18m 11s
CMake -> exporter proto (Build as DLL)	21m 34s
	10h 15m 28s

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