Support parsing arbitrary duration representations #483

Job	Run time
windows-msvc-shared (CAPNPROTO)	7m 48s
windows-msvc-shared (JSON)	10m 48s
windows-msvc-shared (TOML)	4m 0s
windows-msvc-shared (FLEXBUFFERS)	6m 9s
windows-msvc-shared (CBOR)	8m 47s
windows-msvc-shared (AVRO)	7m 44s
windows-msvc-shared (PARQUET)	40m 12s
windows-msvc-shared (XML)	3m 57s
windows-msvc-shared (UBJSON)	7m 2s
windows-msvc-shared (MSGPACK)	3m 54s
windows-msvc-shared (YAML)	4m 13s
windows-msvc (benchmarks)	48m 44s
windows-msvc (CAPNPROTO)	8m 1s
windows-msvc (JSON)	11m 46s
windows-msvc (CBOR)	9m 14s
windows-msvc (YAML)	4m 15s
windows-msvc (FLEXBUFFERS)	6m 3s
windows-msvc (TOML)	4m 5s
windows-msvc (PARQUET)	40m 9s
windows-msvc (AVRO)	7m 19s
windows-msvc (XML)	3m 52s
windows-msvc (MSGPACK)	3m 42s
windows-msvc (UBJSON)	7m 22s
	4h 19m 6s

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