[clang][modules-driver] Add dependency scan and dependency graph (#152770) This patch is part of a series to support driver-managed module builds. It adds support for discovery of module dependencies from within the driver and for generation of the module dependency graph. Source inputs provided on the command line can import modules defined in the Standard library module manifest, which are then scanned on demand. The dependency scan and graph support both Clang modules and C++ named modules. The generated dependency graph can be output in Graphviz DOT format as a remark. RFC discussing linking the driver against additional libraries: https://discourse.llvm.org/t/rfc-driver-link-the-driver-against-clangdependencyscanning-clangast-clangfrontend-clangserialization-and-clanglex RFC for driver-managed module builds: https://discourse.llvm.org/t/rfc-modules-support-simple-c-20-modules-use-from-the-clang-driver-without-a-build-system
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