#230 Add Streaks component

[zwan702]

This helps the user in more easily determining when they will be the busiest with meetups and encounters, and can help them to schedule better.

This feature will be present in the homepage of the app, and will track all the encounters input by the user and use that to build the streaks.

Acceptance Criteria

• [x] Develop a streaks component for use in the frontend
• [x] Modify the homepage to include the new feature
• [x] Implement backend api and calls to allow streaks to properly display the needed data

Implementation details

New api calls in the backend that utilises the current encounters and transforms that to data that can populate the streaks feature.

New dependencies

react-calendar-heatmap react-tooltip