libsysprof-analyze: add memory map and builder objects

The goal here is to have a memory map for each of our processes so that we
can translate a memory address into an offset within a file.

We will then use an upcoming SysprofMountNamespace as a view into a process
file system layout to convert the mapped filename into something we can
access from the current process (be it on the host, or via flatpak, etc).

src/libsysprof-analyze/meson.build

@@ -21,6 +21,7 @@ libsysprof_analyze_public_sources = [
 
 libsysprof_analyze_private_sources = [
   'sysprof-mapped-file.c',
+  'sysprof-memory-map.c',
 ]
 
 libsysprof_analyze_public_headers = [