[EXEMPLAR] Update ExemplarFilter and ExemplarReservoir for spec #9407

Job	Run time
CMake test (with abseil)	4m 27s
CMake clang 15 (maintainer mode, abiv2)	9m 31s
CMake clang 15 (maintainer mode, async)	9m 19s
CMake clang 15 (maintainer mode, sync)	9m 18s
CMake gcc 13 (maintainer mode, async)	6m 45s
CMake gcc 13 (maintainer mode, sync)	6m 39s
CMake msvc (maintainer mode)	5m 40s
CMake msvc (maintainer mode) with C++20	6m 38s
CMake test (with opentracing-shim)	2m 14s
CMake test (without otlp-exporter)	4m 32s
CMake C++14 test(GCC)	4m 2s
CMake C++17 test(GCC)	4m 44s
CMake C++20 test(Clang with libc++)	3m 57s
CMake C++20 test(GCC)	3m 31s
CMake C++23 test(Clang with libc++)	3m 38s
CMake C++23 test(GCC)	3m 26s
CMake test (without otlp-exporter and with async export)	4m 29s
Bazel	3m 42s
Bazel with async export	8m 57s
CMake do not install test (with otlp-exporter)	10m 26s
CMake install test (with abseil)	4m 16s
CMake test (with modern protobuf,grpc and abseil)	15m 24s
CMake test (build shared libraries with otlp-exporter and static gRPC)	11m 19s
CMake test (with otlp-exporter)	10m 18s
Plugin -> CMake	52s
Bazel asan config	1m 21s
Bazel noexcept	9m 21s
Bazel nortti	9m 8s
Bazel on MacOS	9m 46s
Bazel tsan config	1m 46s
Bazel valgrind	4m 2s
Bazel with external abseil	8m 29s
Benchmark	1m 39s
Copyright	4s
Format	13s
CMake -> exporter proto	8m 59s
CMake -> exporter proto (Build as DLL)	15m 38s
Code coverage	2m 41s
DocFX check	49s
markdown-lint	8s
misspell	7s
Bazel Windows	10m 46s
Plugin -> CMake Windows	4m 59s
CMake (With async export) -> exporter proto	8m 47s
	4h 16m 47s

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