Add support for C++-26 reflection #949

Job	Run time
windows-msvc-shared (PARQUET)	49m 36s
windows-msvc-shared (UBJSON)	7m 55s
windows-msvc-shared (JSON)	14m 53s
windows-msvc-shared (BOOST_SERIALIZATION)	6m 35s
windows-msvc-shared (YAML)	4m 38s
windows-msvc-shared (MSGPACK)	4m 15s
windows-msvc-shared (TOML)	4m 23s
windows-msvc (CAPNPROTO)	4m 44s
windows-msvc (MSGPACK)	4m 44s
windows-msvc-shared (CBOR)	10m 8s
windows-msvc (FLEXBUFFERS)	4m 44s
windows-msvc (CEREAL)	4m 44s
windows-msvc (PARQUET)	4m 44s
windows-msvc-shared (XML)	4m 15s
windows-msvc (TOML)	4m 44s
windows-msvc-shared (FLEXBUFFERS)	4m 44s
windows-msvc (AVRO)	4m 44s
windows-msvc (CBOR)	4m 44s
windows-msvc (UBJSON)	4m 44s
windows-msvc (XML)	4m 44s
windows-msvc-shared (CAPNPROTO)	10m 1s
windows-msvc (BOOST_SERIALIZATION)	4m 43s
windows-msvc (benchmarks)	4m 43s
windows-msvc (YAML)	4m 43s
windows-msvc (JSON)	4m 43s
	3h 7m 35s

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