RCPP-41 Add Conan support #33

Job	Run time
build (ubuntu-latest, Debug, True)	11m 23s
build (ubuntu-latest, Debug, False)	3h 53m 9s
build (ubuntu-latest, Release, True)	9m 19s
build (ubuntu-latest, Release, False)	3h 53m 9s
build (windows-latest, Debug, True)	3h 53m 9s
build (windows-latest, Debug, False)	3h 53m 7s
build (windows-latest, Release, True)	12m 45s
build (windows-latest, Release, False)	13m 3s
build (macos-latest, Debug, True)	6m 56s
build (macos-latest, Debug, False)	7m 18s
build (macos-latest, Release, True)	10m 55s
build (macos-latest, Release, False)	9m 23s
	16h 53m 36s

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