resolve http server can't send file large than 2GB (Fix #1290) (#1294)

* resolve problem: http server can't send file large than 2GB.
add unit test for http server send large file.
add /bigobj compile option to msvc x64.

* disable unit test "ServerLargeContentTest" due to out-of-memory on GitHub Actions.

test/test.vcxproj

@@ -116,6 +116,7 @@
       <AdditionalUsingDirectories>
       </AdditionalUsingDirectories>
       <SDLCheck>true</SDLCheck>
+      <AdditionalOptions>/bigobj %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
@@ -158,6 +159,7 @@
       <AdditionalUsingDirectories>
       </AdditionalUsingDirectories>
       <SDLCheck>true</SDLCheck>
+      <AdditionalOptions>/bigobj %(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>