Swift Command-line Tool `executableTarget`

[markst]

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Context 🕵️‍♀️

Has the possibility of creating an executableTarget been considered? This would allow a command-line-interface in order to read and write project pbx. https://www.swift.org/getting-started/cli-swiftpm/

What 🌱

We've like to support Renovate upgrading our Xcode project dependencies. https://github.com/renovatebot/renovate/issues/9735

In order to parse our pbxproj files we need a tool such as XcodeProj to be a distributable binary which could be added a dependency with Node Package Manager.