Add support for configurable token bucket success reward and fractional token management

Adding support for atomic float

Adding support for atomic float

Author: annahay4

.changelog/1763060740.md

@@ -0,0 +1,11 @@
+---
+applies_to:
+- client
+authors:
+- annahay
+references: []
+breaking: false
+new_feature: true
+bug_fix: false
+---
+Add support for configurable token bucket success reward and fractional token management

rust-runtime/aws-smithy-runtime/src/client/retries/strategy/standard.rs

@@ -210,8 +210,11 @@ impl RetryStrategy for StandardRetryStrategy {
             .unwrap_or(false);
         update_rate_limiter_if_exists(runtime_components, cfg, is_throttling_error);
 
-        // on success release any retry quota held by previous attempts
+        // on success release any retry quota held by previous attempts and award success tokens
         if !ctx.is_failed() {
+            // When a request succeeds, we grant an award, if present
+            token_bucket.reward_success();
+
             if let NoPermitWasReleased = self.release_retry_permit() {
                 // In the event that there was no retry permit to release, we generate new
                 // permits from nothing. We do this to make up for permits we had to "forget".