[EXEMPLAR] Update ExemplarFilter and ExemplarReservoir for spec #9405

Job	Run time
CMake clang 15 (maintainer mode, async)	9m 10s
CMake clang 15 (maintainer mode, abiv2)	9m 24s
CMake clang 15 (maintainer mode, sync)	9m 29s
CMake gcc 13 (maintainer mode, async)	4m 50s
CMake gcc 13 (maintainer mode, sync)	4m 17s
CMake msvc (maintainer mode)	5m 46s
CMake msvc (maintainer mode) with C++20	6m 36s
CMake test (without otlp-exporter)	5m 3s
CMake test (with abseil)	4m 46s
CMake test (with opentracing-shim)	3m 42s
CMake test (with otlp-exporter)	11m 23s
CMake C++14 test(GCC)	6m 12s
CMake C++17 test(GCC)	4m 52s
CMake C++20 test(Clang with libc++)	4m 7s
CMake C++20 test(GCC)	3m 34s
CMake C++23 test(Clang with libc++)	4m 12s
CMake C++23 test(GCC)	3m 17s
CMake test (without otlp-exporter and with async export)	5m 19s
Bazel asan config	2m 12s
Bazel noexcept	2m 2s
Bazel nortti	3m 21s
Bazel on MacOS	8m 24s
Bazel	2m 8s
Bazel with async export	9m 47s
Bazel tsan config	1m 50s
Bazel valgrind	9m 46s
Bazel with external abseil	8m 47s
CMake do not install test (with otlp-exporter)	11m 11s
CMake install test (with abseil)	5m 2s
Benchmark	1m 7s
CMake test (with modern protobuf,grpc and abseil)	15m 0s
CMake test (build shared libraries with otlp-exporter and static gRPC)	11m 18s
Format	20s
Plugin -> CMake	1m 9s
Code coverage	3m 15s
Copyright	6s
DocFX check	56s
markdown-lint	10s
misspell	4s
CMake -> exporter proto	10m 52s
Bazel Windows	18m 40s
Plugin -> CMake Windows	5m 52s
CMake (With async export) -> exporter proto	9m 23s
CMake -> exporter proto (Build as DLL)	19m 2s
	4h 27m 43s

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