rdi checksum kinds, rdim checksums, pull parsed checksum kinds/values from cv, fill out rdim checksums (still haven't put into rdi itself yet)

src/lib_rdi_make/rdi_make.h

@@ -540,6 +540,8 @@ struct RDIM_SrcFile
   RDIM_SrcFileLineMapFragment *first_line_map_fragment;
   RDIM_SrcFileLineMapFragment *last_line_map_fragment;
   RDI_U64 total_line_count;
+  RDI_ChecksumKind checksum_kind;
+  RDIM_String8 checksum;
 };
 
 typedef struct RDIM_SrcFileChunkNode RDIM_SrcFileChunkNode;