feature request: support installing imported targets for vcpkg and conan

[FeignClaims]

Although not universally appicable to all IMPORTED targets as #167 is trying to do, vcpkg and conan 2.4.0 already provide a way to install their IMPORTED targets:

• vcpkg provides two options for users to easily copy runtimes to the build directory and installation directory. (learnt from this comment)

• conan 2.4.0's CMakeToolchain generator provides a cmake variable CONAN_RUNTIME_LIB_DIRS that allows users to install runtime libraries. (see the corresponding documentation here)

So maybe we could support them respectively? (or unify them into a general function?)

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