[CMake] Introduce swift-syntax-dev component

[rintaro]

• Separate .swiftmodule from swift-syntax-lib component
• Include SwiftSyntaxMacrosGenericTestSupport libraries and modules in swift-syntax-dev component

rdar://122209853
rdar://114280017

[rintaro]

swiftlang/swift-syntax#3248
@swift-ci Please smoke test

[rintaro]

swiftlang/swift-syntax#3248
@swift-ci Please build toolchain

[compnerd]

Note that this might require changes for the Windows build, including potentially the installer manifest.

[rintaro]

@compnerd apparently Windows installer image doesn't include SwiftSyntax*.swiftmodule so no need to update swift-installer-scripts. Also, for building FoudationMacros etc., modules in the build directory are used. So I don't think we need to "install" .swiftmodule at all. Is there any particular area we need to look at?

[rintaro]

@swift-ci Please smoke test Windows

[rintaro]

swiftlang/swift-syntax#3248
@swift-ci Please smoke test Windows

[compnerd]

@compnerd apparently Windows installer image doesn't include SwiftSyntax*.swiftmodule so no need to update swift-installer-scripts. Also, for building FoudationMacros etc., modules in the build directory are used. So I don't think we need to "install" .swiftmodule at all. Is there any particular area we need to look at?

I was concerned that the components might result in something missing on Windows for the installer. It's an easy check ... which is already done via the Windows toolchain build.