Add enums AeroModel and InitialGammaDistribution #312

Job	Run time
Julia 1.10 - ubuntu-latest - x64 - pull_request	12m 2s
Documentation	3m 7s
Julia 1 - ubuntu-latest - x64 - pull_request	14m 34s
Julia pre - ubuntu-latest - x64 - pull_request	13m 52s
Julia 1 - windows-latest - x64 - pull_request	11m 55s
Julia 1 - macOS-latest - aarch64 - pull_request	6m 16s
	1h 1m 46s

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