Fixed typo in word 'timetamp' & 'Timetamps'

[guizo792]

While using this code, I encountered a typo in the files : mediapipe/framework/calculator_graph_bounds_test.cc mediapipe/framework/calculator_profile.proto mediapipe/framework/profiler/trace_builder.cc mediapipe/java/com/google/mediapipe/components/ExternalTextureConverter.java

The word 'timetamp' was incorrectly used instead of 'timestamp'. I have corrected this typo and opened a pull request referencing the corresponding issue number.