RCPP-61 Add BSON support #74

Job	Run time
build (ubuntu-latest, Debug, True)	11m 54s
build (ubuntu-latest, Debug, False)	11m 49s
build (ubuntu-latest, Release, True)	9m 42s
build (ubuntu-latest, Release, False)	10m 6s
build (windows-latest, Debug, True)	20m 20s
build (windows-latest, Debug, False)	20m 26s
build (windows-latest, Release, True)	12m 29s
build (windows-latest, Release, False)	12m 28s
build (macos-latest, Debug, True)	6m 14s
build (macos-latest, Debug, False)	5m 49s
build (macos-latest, Release, True)	6m 57s
build (macos-latest, Release, False)	7m 54s
	2h 16m 8s

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