Extend Tutorials Section

[CursedRock17]

As per the title we could keep expanding the tutorials section of our message_filters documentation because you can never have enough documentation. Specifically #119 (comment) specifies for us to add an ApproximateEpsilonTime tutorials. That being said the following policies and objects could technically have their own tutorials:

• ApproximateEpsilonTime (C++)
• LatestTime (C++)
• Chain (C++)
• Cache (C++)
• Cache (Python)

Possibly:

• Custom Simple Filter (C++ - Intermediate)
• Custom Simple Filter (Python - Intermediate)

I should be able to get to most of these relatively fast, but they should be in one location ready for tracking. Additionally since most of tfhe documentation is hosted on message_filters this shouldn't need to go to ros2_documentation

[fujitatomoya]

/label help-wanted @ahcorde can you add the label, cz i do not have power to do that.