Add support for a new attribute #[debugger_visualizer] to support embedding debugger visualizers into a generated PDB.

Cleanup `DebuggerVisualizerFile` type and other minor cleanup of queries.

Merge the queries for debugger visualizers into a single query.

Revert move of `resolve_path` to `rustc_builtin_macros`. Update dependencies in Cargo.toml for `rustc_passes`.

Respond to PR comments. Load visualizer files into opaque bytes `Vec<u8>`. Debugger visualizers for dynamically linked crates should not be embedded in the current crate.

Update the unstable book with the new feature. Add the tracking issue for the debugger_visualizer feature.

Respond to PR comments and minor cleanups.

src/test/ui/invalid/invalid-debugger-visualizer-option.rs

@@ -0,0 +1,4 @@
+#![feature(debugger_visualizer)]
+#![debugger_visualizer(random_file = "../foo.random")] //~ ERROR invalid argument
+
+fn main() {}

src/test/ui/invalid/invalid-debugger-visualizer-option.stderr

@@ -0,0 +1,10 @@
+error: invalid argument
+  --> $DIR/invalid-debugger-visualizer-option.rs:2:1
+   |
+LL | #![debugger_visualizer(random_file = "../foo.random")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: expected: `natvis_file = "..."`
+
+error: aborting due to previous error
+

src/test/ui/invalid/invalid-debugger-visualizer-target.rs

@@ -0,0 +1,5 @@
+#![feature(debugger_visualizer)]
+
+#[debugger_visualizer(natvis_file = "../foo.natvis")] //~ ERROR attribute should be applied to a module
+
+fn main() {}

src/test/ui/invalid/invalid-debugger-visualizer-target.stderr

@@ -0,0 +1,8 @@
+error: attribute should be applied to a module
+  --> $DIR/invalid-debugger-visualizer-target.rs:3:1
+   |
+LL | #[debugger_visualizer(natvis_file = "../foo.natvis")]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+