v3.42.33: Add cenkalti/backoff for exponential backoff retry

- Exponential backoff retry for all cloud operations (S3, Azure, GCS)
- RetryConfig presets: Default (5x), Aggressive (10x), Quick (3x)
- Smart error classification: IsPermanentError, IsRetryableError
- Automatic file position reset on upload retry
- Retry logging with wait duration
- Multipart uploads use aggressive retry (more tolerance)

go.mod

@@ -57,6 +57,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/sts v1.41.2 // indirect
 	github.com/aws/smithy-go v1.23.2 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
 	github.com/charmbracelet/x/ansi v0.10.1 // indirect