perf(web): 字典初始化使用源字典容量避免扩容

Dictionary 创建时传入源字典 Count 作为初始容量，
避免 foreach 拷贝过程中触发多次 Resize。

GameFrameX/com.gameframex.unity#5

Author: AlianBlank

Runtime/Web/WebManager.WebBinaryData.cs

@@ -49,7 +49,7 @@ public static WebBinaryData Create(string url, Dictionary<string, string> header
                 {
                     if (data.m_Header == null)
                     {
-                        data.m_Header = new Dictionary<string, string>();
+                        data.m_Header = new Dictionary<string, string>(header.Count);
                     }
                     else
                     {

Runtime/Web/WebManager.WebJsonData.cs

@@ -133,7 +133,7 @@ private static void CopyHeader(WebJsonData data, Dictionary<string, string> head
 
                 if (data.m_Header == null)
                 {
-                    data.m_Header = new Dictionary<string, string>();
+                    data.m_Header = new Dictionary<string, string>(header.Count);
                 }
                 else
                 {
@@ -155,7 +155,7 @@ private static void CopyForm(WebJsonData data, Dictionary<string, object> form)
 
                 if (data.m_Form == null)
                 {
-                    data.m_Form = new Dictionary<string, object>();
+                    data.m_Form = new Dictionary<string, object>(form.Count);
                 }
                 else
                 {