Add end-of-file-fixer pre-commit hook (#3176)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

include/mbgl/util/bitmask_operations.hpp

@@ -29,4 +29,4 @@ constexpr Enum operator~(Enum value) {
     return Enum(~mbgl::underlying_type(value));
 }
 
-} // namespace mbgl
+} // namespace mbgl

include/mbgl/util/monotonic_timer.hpp

@@ -19,4 +19,4 @@ public:
 };
 
 } // namespace util
-} // namespace mbgl
+} // namespace mbgl