[EXEMPLAR] Update ExemplarFilter and ExemplarReservoir for spec #9401

Job	Run time
CMake test (with abseil)	4m 23s
CMake clang 15 (maintainer mode, abiv2)	9m 27s
CMake clang 15 (maintainer mode, async)	9m 36s
CMake clang 15 (maintainer mode, sync)	9m 42s
CMake gcc 13 (maintainer mode, async)	4m 50s
CMake gcc 13 (maintainer mode, sync)	4m 36s
CMake msvc (maintainer mode)	7m 36s
CMake msvc (maintainer mode) with C++20	6m 40s
CMake test (with opentracing-shim)	2m 5s
CMake test (without otlp-exporter)	4m 56s
CMake C++14 test(GCC)	4m 39s
CMake test (without otlp-exporter and with async export)	4m 33s
Bazel noexcept	8m 22s
Bazel	3m 28s
Bazel with async export	2m 23s
Bazel valgrind	9m 10s
Bazel with external abseil	4m 32s
CMake do not install test (with otlp-exporter)	10m 54s
CMake install test (with abseil)	5m 4s
CMake test (with modern protobuf,grpc and abseil)	14m 59s
CMake test (build shared libraries with otlp-exporter and static gRPC)	11m 9s
CMake test (with otlp-exporter)	10m 41s
CMake C++17 test(GCC)	4m 36s
CMake C++20 test(Clang with libc++)	3m 57s
CMake C++20 test(GCC)	4m 23s
CMake C++23 test(Clang with libc++)	3m 42s
CMake C++23 test(GCC)	3m 46s
Plugin -> CMake	1m 9s
Bazel asan config	1m 36s
Bazel nortti	4m 16s
Bazel on MacOS	10m 18s
Bazel tsan config	2m 2s
Benchmark	1m 42s
Code coverage	2m 59s
Copyright	15s
DocFX check	1m 4s
Format	13s
markdown-lint	6s
misspell	3s
CMake -> exporter proto	8m 58s
Bazel Windows	7m 14s
Plugin -> CMake Windows	5m 36s
CMake (With async export) -> exporter proto	9m 18s
CMake -> exporter proto (Build as DLL)	21m 59s
	4h 12m 57s

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