Add test experiments

[becky-gilbert]

This PR adds a tests directory for jsPsych experiment code that can be used for testing and updated as needed. We should include test experiments for each combination of experiment scenarios (combinations of our custom plugins/extensions and parameters) that we need to test. These are meant to be 'minimum viable jsPsych-lookit experiments', i.e. they include all parts of a valid CHS experiment, but with a basic placeholder trial for the jsPsych task. Here is what is included:

• exit_survey_parameters: Uses the non-default values for the exit survey parameters.
• survey_consent_no_recording: Uses a survey consent trial and does not do any recording.
• video_consent_session_recording: Video consent trial with session recording.
• video_consent_trial_recording: Video consent trial with trial recording.

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Latest commit: 3429550

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[okaycj]

I like this. Thank you.