[EXPORTER] OTLP file exporter (#2540) #194

Job	Run time
Bazel asan config	10m 31s
Bazel noexcept	8m 20s
Bazel nortti	12m 11s
Bazel on MacOS	10m 12s
Bazel	12m 36s
Bazel with async export	9m 14s
Bazel tsan config	9m 12s
Bazel with external abseil	9m 51s
Bazel valgrind	11m 38s
Benchmark	3m 32s
CMake test (with abseil)	4m 54s
CMake clang 15 (maintainer mode, async)	14m 49s
CMake clang 15 (maintainer mode, abiv2)	14m 55s
CMake clang 15 (maintainer mode, sync)	15m 0s
CMake do not install test (with otlp-exporter)	14m 27s
CMake gcc 13 (maintainer mode, async)	7m 10s
CMake gcc 13 (maintainer mode, sync)	7m 13s
CMake install test (with abseil)	4m 37s
CMake msvc (maintainer mode)	7m 25s
CMake msvc (maintainer mode) with C++20	9m 0s
CMake test (with opentracing-shim)	4m 31s
CMake test (with modern protobuf,grpc and abseil)	18m 59s
CMake test (build shared libraries with otlp-exporter and static gRPC)	14m 14s
CMake test (with otlp-exporter)	15m 4s
CMake test (without otlp-exporter)	5m 1s
CMake C++14 test(GCC)	4m 40s
CMake C++17 test(GCC)	4m 50s
CMake C++20 test(Clang with libc++)	10m 0s
CMake C++20 test(GCC)	8m 48s
CMake C++23 test(Clang with libc++)	10m 18s
CMake test (without otlp-exporter and with async export)	5m 26s
CMake C++23 test(GCC)	8m 36s
Copyright	9s
DocFX check	47s
Format	20s
Code coverage	11m 43s
markdown-lint	5s
misspell	9s
Plugin -> CMake	1m 49s
shellcheck	6s
CMake -> exporter proto	12m 12s
Bazel Windows	20m 43s
Plugin -> CMake Windows	6m 38s
CMake (With async export) -> exporter proto	11m 59s
CMake -> exporter proto (Build as DLL)	24m 54s
	6h 38m 48s

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