feat(native): Add http server request size counter (#26540)

```
== NO RELEASE NOTE ==
```

Author: kewang1024

presto-native-execution/presto_cpp/main/common/Counters.cpp

@@ -30,6 +30,15 @@ void registerPrestoMetrics() {
   DEFINE_METRIC(kCounterNumHTTPRequest, facebook::velox::StatType::COUNT);
   DEFINE_METRIC(kCounterNumHTTPRequestError, facebook::velox::StatType::COUNT);
   DEFINE_METRIC(kCounterHTTPRequestLatencyMs, facebook::velox::StatType::AVG);
+  DEFINE_HISTOGRAM_METRIC(
+      kCounterHTTPRequestSizeBytes,
+      1 * 1024, // 1KB bucket size
+      0,
+      5 * 1024 * 1024, // 5MB max
+      50,
+      90,
+      99,
+      100);
   DEFINE_METRIC(
       kCounterHttpClientNumConnectionsCreated, facebook::velox::StatType::SUM);
   // Tracks http client transaction create delay in range of [0, 30s] with

presto-native-execution/presto_cpp/main/common/Counters.h

@@ -38,6 +38,8 @@ constexpr folly::StringPiece kCounterNumHTTPRequestError{
     "presto_cpp.num_http_request_error"};
 constexpr folly::StringPiece kCounterHTTPRequestLatencyMs{
     "presto_cpp.http_request_latency_ms"};
+constexpr folly::StringPiece kCounterHTTPRequestSizeBytes{
+    "presto_cpp.http_request_size_bytes"};
 
 constexpr folly::StringPiece kCounterHttpClientNumConnectionsCreated{
     "presto_cpp.http.client.num_connections_created"};

presto-native-execution/presto_cpp/main/http/filters/StatsFilter.cpp

@@ -28,18 +28,28 @@ void StatsFilter::onRequest(
   Filter::onRequest(std::move(msg));
 }
 
+void StatsFilter::onBody(std::unique_ptr<folly::IOBuf> body) noexcept {
+  if (body) {
+    requestBodySize_ += body->computeChainDataLength();
+  }
+  Filter::onBody(std::move(body));
+}
+
 void StatsFilter::requestComplete() noexcept {
   RECORD_METRIC_VALUE(
       kCounterHTTPRequestLatencyMs,
       std::chrono::duration_cast<std::chrono::milliseconds>(
           std::chrono::steady_clock::now() - startTime_)
           .count());
-  delete this;
+  VLOG(2) << "StatsFilter::requestComplete: recording request size="
+          << requestBodySize_ << " bytes";
+  RECORD_HISTOGRAM_METRIC_VALUE(kCounterHTTPRequestSizeBytes, requestBodySize_);
+  Filter::requestComplete();
 }
 
 void StatsFilter::onError(proxygen::ProxygenError err) noexcept {
   RECORD_METRIC_VALUE(kCounterNumHTTPRequestError, 1);
-  delete this;
+  Filter::onError(err);
 }
 
 } // namespace facebook::presto::http::filters

presto-native-execution/presto_cpp/main/http/filters/StatsFilter.h

@@ -25,12 +25,15 @@ class StatsFilter : public proxygen::Filter {
 
   void onRequest(std::unique_ptr<proxygen::HTTPMessage> msg) noexcept override;
 
+  void onBody(std::unique_ptr<folly::IOBuf> body) noexcept override;
+
   void requestComplete() noexcept override;
 
   void onError(proxygen::ProxygenError err) noexcept override;
 
  private:
   std::chrono::steady_clock::time_point startTime_;
+  size_t requestBodySize_{0};
 };
 
 class StatsFilterFactory : public proxygen::RequestHandlerFactory {
@@ -43,7 +46,7 @@ class StatsFilterFactory : public proxygen::RequestHandlerFactory {
 
   proxygen::RequestHandler* onRequest(
       proxygen::RequestHandler* handler,
-      proxygen::HTTPMessage*) noexcept override {
+      proxygen::HTTPMessage* msg) noexcept override {
     return new StatsFilter(handler);
   }
 };