Add support for C++-26 reflection #955

Job	Run time
windows-msvc-shared (BOOST_SERIALIZATION)	7m 16s
windows-msvc-shared (MSGPACK)	4m 11s
windows-msvc-shared (TOML)	4m 25s
windows-msvc-shared (YAML)	4m 52s
windows-msvc-shared (CBOR)	8m 45s
windows-msvc (benchmarks)	59m 52s
windows-msvc-shared (XML)	4m 10s
windows-msvc-shared (PARQUET)	48m 26s
windows-msvc-shared (FLEXBUFFERS)	5m 52s
windows-msvc-shared (CAPNPROTO)	9m 5s
windows-msvc (CAPNPROTO)	6m 36s
windows-msvc (XML)	3m 57s
windows-msvc (JSON)	10m 34s
windows-msvc (MSGPACK)	3m 55s
windows-msvc (UBJSON)	7m 32s
windows-msvc (AVRO)	6m 42s
windows-msvc (CBOR)	10m 46s
windows-msvc (CEREAL)	4m 21s
windows-msvc (FLEXBUFFERS)	6m 14s
windows-msvc-shared (JSON)	14m 5s
windows-msvc (YAML)	4m 35s
windows-msvc-shared (UBJSON)	7m 55s
windows-msvc (BOOST_SERIALIZATION)	7m 4s
windows-msvc (PARQUET)	34m 26s
windows-msvc (TOML)	4m 17s
	4h 49m 53s

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