Add support for C++-26 reflection #947

Job	Run time
windows-msvc-shared (FLEXBUFFERS)	5m 51s
windows-msvc-shared (MSGPACK)	3m 20s
windows-msvc-shared (JSON)	13m 42s
windows-msvc-shared (PARQUET)	50m 23s
windows-msvc (MSGPACK)	4m 38s
windows-msvc-shared (UBJSON)	7m 57s
windows-msvc (YAML)	5m 6s
windows-msvc (JSON)	15m 2s
windows-msvc (TOML)	4m 2s
windows-msvc (CAPNPROTO)	8m 13s
windows-msvc (benchmarks)	1h 2m 14s
windows-msvc-shared (BOOST_SERIALIZATION)	7m 6s
windows-msvc (PARQUET)	49m 7s
windows-msvc (AVRO)	7m 33s
windows-msvc (CEREAL)	4m 38s
windows-msvc-shared (CAPNPROTO)	9m 35s
windows-msvc-shared (CBOR)	11m 17s
windows-msvc-shared (YAML)	4m 24s
windows-msvc (FLEXBUFFERS)	4m 46s
windows-msvc (UBJSON)	7m 28s
windows-msvc-shared (TOML)	4m 13s
windows-msvc (XML)	4m 22s
windows-msvc (BOOST_SERIALIZATION)	7m 2s
windows-msvc (CBOR)	11m 16s
windows-msvc-shared (XML)	4m 10s
	5h 17m 25s

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