fix(dso): do not eagerly resolve symlinks

This change contains three improvements:

- we use a separate root node, so that it is easier to debug
  what is going on
- we now are able to print the DOT graph of ELF binaries in
  DsoCleaner
- we do not eagerly resolve symlinks, which produced completely
  incorrect results before

Cargo.lock

@@ -328,6 +328,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "indoc"
+version = "2.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b248f5224d1d606005e02c97f5aa4e88eeb230488bcc03bc9ca4d7991399f2b5"
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
@@ -632,6 +638,7 @@ dependencies = [
  "env_logger",
  "goblin",
  "ignore",
+ "indoc",
  "log",
  "memmap2",
  "nix",