Add enums AeroModel and InitialGammaDistribution #310

Job	Run time
Documentation	2m 11s
Julia 1.10 - ubuntu-latest - x64 - pull_request	40m 12s
Julia 1 - ubuntu-latest - x64 - pull_request	40m 13s
Julia pre - ubuntu-latest - x64 - pull_request	14m 16s
Julia 1 - windows-latest - x64 - pull_request	12m 52s
Julia 1 - macOS-latest - aarch64 - pull_request	6m 2s
	1h 55m 46s

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