RCPP-41 Add Conan support #42

Job	Run time
build (ubuntu-latest, Debug, True)	11m 44s
build (ubuntu-latest, Debug, False)	3h 52m 38s
build (ubuntu-latest, Release, True)	9m 28s
build (ubuntu-latest, Release, False)	3h 52m 35s
build (windows-latest, Debug, True)	20m 22s
build (windows-latest, Debug, False)	20m 19s
build (windows-latest, Release, True)	12m 57s
build (windows-latest, Release, False)	13m 3s
build (macos-latest, Debug, True)	6m 30s
build (macos-latest, Debug, False)	6m 56s
build (macos-latest, Release, True)	7m 36s
build (macos-latest, Release, False)	7m 11s
	9h 41m 19s

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