[EXEMPLAR] Update ExemplarFilter and ExemplarReservoir for spec #9431

Job	Run time
Bazel noexcept	12m 17s
Bazel asan config	15m 58s
Bazel nortti	12m 19s
Bazel on MacOS	26m 44s
Bazel	12m 23s
Bazel with async export	12m 14s
Bazel tsan config	12m 51s
Bazel valgrind	14m 50s
Bazel with external abseil	12m 14s
Benchmark	8m 3s
CMake test (with abseil)	4m 24s
CMake clang 15 (maintainer mode, abiv2)	13m 52s
CMake clang 15 (maintainer mode, async)	14m 9s
CMake clang 15 (maintainer mode, sync)	14m 4s
CMake do not install test (with otlp-exporter)	14m 0s
CMake gcc 13 (maintainer mode, async)	6m 34s
CMake gcc 13 (maintainer mode, sync)	7m 5s
CMake install test (with abseil)	4m 15s
CMake test (with modern protobuf,grpc and abseil)	18m 45s
CMake msvc (maintainer mode)	9m 10s
CMake msvc (maintainer mode) with C++20	9m 5s
CMake test (with opentracing-shim)	4m 12s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 21s
CMake test (with otlp-exporter)	13m 37s
CMake test (without otlp-exporter)	4m 37s
CMake C++14 test(GCC)	4m 1s
CMake C++17 test(GCC)	4m 32s
CMake C++20 test(Clang with libc++)	9m 34s
CMake C++20 test(GCC)	8m 31s
CMake C++23 test(Clang with libc++)	9m 22s
CMake C++23 test(GCC)	8m 31s
CMake test (without otlp-exporter and with async export)	4m 47s
Code coverage	11m 41s
Copyright	5s
DocFX check	1m 20s
Format	14s
markdown-lint	6s
misspell	5s
Plugin -> CMake	1m 8s
CMake -> exporter proto	11m 45s
Bazel Windows	21m 59s
Plugin -> CMake Windows	6m 24s
CMake (With async export) -> exporter proto	12m 30s
CMake -> exporter proto (Build as DLL)	27m 9s
	7h 14m 47s

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