fix(rate-limiter): resolve clippy warnings for CI

- Add #[allow(clippy::should_implement_trait)] on Algorithm::from_str
- Add Default impl for MemoryStore (new_without_default)
- Replace map_or(false, ...) with is_some_and (unnecessary_map_or)

Signed-off-by: Pratik Gandhi <gandhipratik203@gmail.com>

Author: gandhipratik203

plugins_rust/rate_limiter/src/config.rs

@@ -78,6 +78,8 @@ pub enum Algorithm {
 }
 
 impl Algorithm {
+    /// Parse an algorithm name from a string.
+    #[allow(clippy::should_implement_trait)]
     pub fn from_str(s: &str) -> Option<Self> {
         match s.trim().to_ascii_lowercase().as_str() {
             "fixed_window" => Some(Self::FixedWindow),

plugins_rust/rate_limiter/src/memory.rs

@@ -64,6 +64,12 @@ pub struct MemoryStore {
     call_count: AtomicU64,
 }
 
+impl Default for MemoryStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl MemoryStore {
     pub fn new() -> Self {
         Self {
@@ -280,7 +286,7 @@ fn sliding_window(
 ) -> DimResult {
     // Evict timestamps older than the window (amortized cleanup).
     let cutoff = now_mono.saturating_sub(window_nanos);
-    while timestamps.front().map_or(false, |&t| t <= cutoff) {
+    while timestamps.front().is_some_and(|&t| t <= cutoff) {
         timestamps.pop_front();
     }