Support access groups (#76)

Author: daniel-thom

Cargo.toml

@@ -146,6 +146,7 @@ server = [
     "dep:tracing",
     "dep:bcrypt",
     "dep:rust-embed",
+    "dep:parking_lot",
 ]
 client = [
     "dep:reqwest",
@@ -224,6 +225,7 @@ sha2 = { workspace = true, optional = true }
 tracing = { workspace = true, optional = true }
 bcrypt = { workspace = true, optional = true }
 rust-embed = { workspace = true, optional = true }
+parking_lot = { workspace = true, optional = true }
 
 # Client dependencies (optional)
 reqwest = { workspace = true, optional = true }