[EXEMPLAR] Update ExemplarFilter and ExemplarReservoir for spec #9427

Job	Run time
Bazel nortti	11m 24s
Bazel noexcept	9m 41s
Bazel asan config	12m 1s
Bazel on MacOS	26m 50s
Bazel	12m 18s
Bazel with async export	12m 12s
Bazel tsan config	13m 42s
Bazel valgrind	10m 22s
Bazel with external abseil	11m 45s
Benchmark	8m 23s
CMake test (with abseil)	4m 47s
CMake clang 15 (maintainer mode, abiv2)	14m 8s
CMake clang 15 (maintainer mode, async)	14m 23s
CMake clang 15 (maintainer mode, sync)	14m 5s
CMake do not install test (with otlp-exporter)	13m 52s
CMake gcc 13 (maintainer mode, async)	6m 40s
CMake gcc 13 (maintainer mode, sync)	6m 45s
CMake install test (with abseil)	4m 43s
CMake test (with modern protobuf,grpc and abseil)	19m 14s
CMake msvc (maintainer mode)	7m 24s
CMake msvc (maintainer mode) with C++20	8m 59s
CMake test (with opentracing-shim)	4m 28s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 49s
CMake test (with otlp-exporter)	14m 14s
CMake test (without otlp-exporter)	4m 41s
CMake C++14 test(GCC)	4m 22s
CMake C++17 test(GCC)	4m 33s
CMake C++20 test(Clang with libc++)	9m 18s
CMake C++20 test(GCC)	8m 38s
CMake C++23 test(Clang with libc++)	9m 22s
CMake C++23 test(GCC)	9m 5s
CMake test (without otlp-exporter and with async export)	5m 19s
Code coverage	11m 16s
Copyright	12s
DocFX check	52s
Format	17s
markdown-lint	6s
misspell	3s
Plugin -> CMake	53s
CMake -> exporter proto	11m 47s
Bazel Windows	19m 39s
Plugin -> CMake Windows	6m 24s
CMake (With async export) -> exporter proto	11m 59s
CMake -> exporter proto (Build as DLL)	34m 35s
	7h 9m 30s

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