move ControlPlots to extension #318

Job	Run time
Documentation	2m 37s
Julia 1.10 - ubuntu-latest - x64 - pull_request	4m 53s
Julia 1 - ubuntu-latest - x64 - pull_request	4m 53s
Julia pre - ubuntu-latest - x64 - pull_request	4m 54s
Julia 1 - windows-latest - x64 - pull_request	4m 39s
Julia 1 - macOS-latest - aarch64 - pull_request	4m 55s
	26m 51s

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