[Exporter] Group spans by resource and instrumentation scope in OTLP export requests #8564

Job	Run time
Bazel asan config	11m 7s
Bazel nortti	22m 59s
Bazel noexcept	20m 3s
Bazel on MacOS	27m 3s
Bazel	20m 19s
Bazel with async export	23m 35s
Bazel valgrind	22m 19s
Bazel tsan config	24m 26s
Bazel with external abseil	19m 30s
Benchmark	14m 29s
CMake test (with abseil)	7m 46s
CMake clang 14 (maintainer mode, async)	17m 6s
CMake clang 14 (maintainer mode, sync)	17m 27s
CMake do not install test (with otlp-exporter)	20m 48s
CMake gcc 4.8 (with otlp exporter)	17m 3s
CMake gcc 4.8 (without otlp exporter)	6m 0s
CMake gcc 12 (maintainer mode, async)	11m 50s
CMake gcc 12 (maintainer mode, C++11, async)	13m 42s
CMake gcc 12 (maintainer mode, sync)	11m 26s
CMake install test (with abseil)	7m 51s
CMake test (with modern protobuf,grpc and abseil)	35m 9s
CMake msvc (maintainer mode)	12m 7s
CMake test (with opentracing-shim)	6m 26s
CMake test (build shared libraries with otlp-exporter and static gRPC)	24m 19s
CMake test (with otlp-exporter)	20m 13s
CMake test (without otlp-exporter)	8m 8s
CMake C++20 test(Clang with libc++)	11m 44s
CMake C++20 test(GCC)	14m 52s
Code coverage	14m 55s
Copyright	8s
CMake test (without otlp-exporter and with async export)	7m 8s
DocFX check	1m 15s
Format	20s
markdown-lint	11s
misspell	8s
Plugin -> CMake	1m 8s
CMake -> exporter proto	17m 28s
Bazel Windows	36m 7s
Plugin -> CMake Windows	9m 2s
CMake (With async export) -> exporter proto	23m 45s
CMake -> exporter proto (Build as DLL)	17m 13s
	9h 58m 35s

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