✨ Add composable logger core utilities

bitlogger/file_backend_stub.mbt

@@ -0,0 +1,31 @@
+pub struct FileHandle {
+  path : String
+}
+
+fn open_file_handle_internal(path : String, append : Bool) -> FileHandle? {
+  ignore(append)
+  ignore(path)
+  let _unused : FileHandle = { path: "" }
+  ignore(_unused)
+  None
+}
+
+fn write_file_handle_internal(handle : FileHandle, content : String) -> Bool {
+  ignore(handle)
+  ignore(content)
+  false
+}
+
+fn flush_file_handle_internal(handle : FileHandle) -> Bool {
+  ignore(handle)
+  false
+}
+
+fn close_file_handle_internal(handle : FileHandle) -> Bool {
+  ignore(handle)
+  false
+}
+
+fn native_files_supported_internal() -> Bool {
+  false
+}