Build libSwiftStaticMirror as a standalone library with minimal required dependencies.

This separates it from `libSwiftScan` and allows us to build this library without building much of the rest of the compiler.

Also refactor `utils/build-parser-lib` into `utils/build-tooling-libs` which builds both SwiftSyntaxParser and SwiftStaticMirror.

include/swift-c/DependencyScan/module.modulemap

@@ -1,4 +1,4 @@
 module _InternalSwiftScan {
-  header "LibSwiftScan.h"
+  header "DependencyScan.h"
   link "_InternalSwiftScan"
 }