feat(client/smartrequest): Add streaming and raw buffer support to SmartRequest (buffer, stream, raw); update docs and tests

ts/client/types/common.ts

@@ -66,3 +66,9 @@ export interface RateLimitConfig {
   backoffFactor?: number; // Exponential backoff factor (default: 2)
   onRateLimit?: (attempt: number, waitTime: number) => void; // Callback for rate limit events
 }
+
+/**
+ * Raw streaming function for advanced request body control
+ * Note: The request parameter type depends on the environment (Node.js ClientRequest or fetch Request)
+ */
+export type RawStreamFunction = (request: any) => void;