Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files

Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.

crates/utils/proc-macros/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "proc_macros"
+version = "0.16.22"
+edition = "2024"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = { version = "3.0", features = ["full"] }
+quote = "1.0"