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/StaticMirror/module.modulemap

@@ -0,0 +1,4 @@
+module _InternalStaticMirror {
+  header "BinaryScan.h"
+  link "_InternalStaticMirror"
+}