Add platform-specific MVCHECK/MVDCHECK macros for binary size reduction

Summary:
Add platform-specific CHECK macros that preserve debug messages on server
while completely eliminating message strings on mobile builds.

Implementation uses variadic macros with Buck select():
- Server (MvfstCheck.h): Maps to glog CHECK/DCHECK with __VA_OPT__ for
  optional message support. Messages are preserved in binary and logged
  on failure.
- Mobile (MvfstCheck-mobile.h): Uses std::abort() and completely ignores
  variadic message arguments at the preprocessor level, guaranteeing no
  message strings in the binary. MVDCHECK is eliminated entirely.

Changes:
- Add MvfstCheck.h (server) and MvfstCheck-mobile.h (mobile) with BUCK
  select() to swap headers based on platform
- Replace CHECK/CHECK_EQ/etc with MVCHECK variants throughout quic/
- Replace DCHECK/DCHECK_EQ/etc with MVDCHECK variants throughout quic/
- Pass debug messages as variadic macro arguments instead of streaming

Reviewed By: jbeshay

Differential Revision: D89497050

fbshipit-source-id: 0d03d48f835138dde39543a20fc41cae28bdc92f

Author: Matt Joras

build/fbcode_builder/CMake/FBCompilerSettingsMSVC.cmake

@@ -8,4 +8,5 @@
 
 add_compile_options(
   /wd4250 # 'class1' : inherits 'class2::member' via dominance
+  /Zc:preprocessor # Enable conforming preprocessor for __VA_OPT__ support
 )