Add dynamic catch 2 install

CMakeLists.txt

@@ -54,7 +54,15 @@ endif()
 
 if(WARPPIPE_BUILD_TESTS)
   enable_testing()
-  find_package(Catch2 3 REQUIRED)
+  find_package(Catch2 3 QUIET)
+  if(NOT Catch2_FOUND)
+    FetchContent_Declare(Catch2
+      GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+      GIT_TAG        v3.5.2
+    )
+    FetchContent_MakeAvailable(Catch2)
+    list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/extras)
+  endif()
   add_executable(warppipe_tests tests/warppipe_tests.cpp)
   target_link_libraries(warppipe_tests PRIVATE warppipe Catch2::Catch2WithMain)
   target_compile_definitions(warppipe PRIVATE WARPPIPE_TESTING)