Replace lazy_static with once_cell

Using lazy_static is now discouraged as unmaintained
and once_cell is the recommended replacement.

On top of that a similar implementation found in
once_cell is being tracked for inclusion under the
`lazy_cell` feature gate [0]

[0] rust-lang/rust#109736

Change-Id: I21d343a38dbd25bb2d13f239f7fa3a2d7f20323e

libstats/pull_rust/Android.bp

@@ -60,8 +60,8 @@ rust_library {
     crate_name: "statspull_rust",
     srcs: ["stats_pull.rs"],
     rustlibs: [
-        "liblazy_static",
         "liblog_rust",
+        "libonce_cell",
         "libstatslog_rust_header",
         "libstatspull_bindgen",
     ],

libstats/pull_rust/stats_pull.rs

@@ -14,7 +14,7 @@
 
 //! A Rust interface for the StatsD pull API.
 
-use lazy_static::lazy_static;
+use once_cell::sync::Lazy;
 use statslog_rust_header::{Atoms, Stat, StatsError};
 use statspull_bindgen::*;
 use std::collections::HashMap;
@@ -107,9 +107,8 @@ impl Default for Metadata {
     }
 }
 
-lazy_static! {
-    static ref COOKIES: Mutex<HashMap<i32, fn() -> StatsPullResult>> = Mutex::new(HashMap::new());
-}
+static COOKIES: Lazy<Mutex<HashMap<i32, fn() -> StatsPullResult>>> =
+    Lazy::new(|| Mutex::new(HashMap::new()));
 
 /// # Safety
 ///