Implement --file-names-only (#8788)

* flatc builds and seems to work, some of the extra targets are having linker errors

* fix build system

* pipeline failures

* un-rename files

* refactor to use unique_ptr

* typo

* rm make_unique, add comments

* fix cmake

---------

Co-authored-by: Wouter van Oortmerssen <aardappel@gmail.com>

tests/fuzzer/CMakeLists.txt

@@ -110,6 +110,8 @@ set(FlatBuffers_Library_SRCS
     ${FLATBUFFERS_DIR}/include/flatbuffers/vector.h
     ${FLATBUFFERS_DIR}/include/flatbuffers/vector_downward.h
     ${FLATBUFFERS_DIR}/include/flatbuffers/verifier.h
+    ${FLATBUFFERS_DIR}/src/file_manager.cpp
+    ${FLATBUFFERS_DIR}/src/file_name_manager.cpp
     ${FLATBUFFERS_DIR}/src/idl_parser.cpp
     ${FLATBUFFERS_DIR}/src/idl_gen_text.cpp
     ${FLATBUFFERS_DIR}/src/reflection.cpp
@@ -139,9 +141,8 @@ set(FlatBuffers_Compiler_SRCS
   ${FLATBUFFERS_DIR}/src/idl_gen_grpc.cpp
   ${FLATBUFFERS_DIR}/src/idl_gen_json_schema.cpp
   ${FLATBUFFERS_DIR}/src/idl_gen_swift.cpp
-  ${FLATBUFFERS_DIR}/src/file_name_saving_file_manager.cpp
-  ${FLATBUFFERS_DIR}/src/file_binary_writer.cpp
-  ${FLATBUFFERS_DIR}/src/file_writer.cpp
+  ${FLATBUFFERS_DIR}/src/file_manager.cpp
+  ${FLATBUFFERS_DIR}/src/file_name_manager.cpp
   ${FLATBUFFERS_DIR}/src/idl_namer.h
   ${FLATBUFFERS_DIR}/src/namer.h
   ${FLATBUFFERS_DIR}/src/flatc.cpp
@@ -260,7 +261,7 @@ if(BUILD_DEBUGGER)
       >
       -fno-limit-debug-info
   )
-  
+
   target_link_libraries(
     flatbuffers_nonfuzz
     PUBLIC
@@ -293,5 +294,5 @@ if(BUILD_DEBUGGER)
     COMMAND ${CMAKE_COMMAND} -E copy
     ${CMAKE_SOURCE_DIR}/../monster_test.bfbs
     ${CMAKE_CURRENT_BINARY_DIR}/monster_test.bfbs)
-  
+
 endif(BUILD_DEBUGGER)