Add cxttap and mouseout events

[eai-oen]

About

I am adding 'cxttap' (right click/two-finger tap) and 'mouseout' events to dash cytoscape for both nodes and edges.

Description of changes

Adds 'ctxtap' and 'mouseout' event listeners to cytoscape.

Pre-Merge checklist

• The project was correctly built with npm run build:all.
• If there was any conflict, it was solved correctly.
• All changes were documented in CHANGELOG.md.
• All tests on CircleCI have passed.
• All Percy visual changes have been approved.
• Two people have 💃'd the pull request. You can be one of these people if you are a Dash Cytoscape core contributor.

Reference Issues

See #151

Other comments

On a side note, I changed package-info.json to package.json, and also change the npm run build:backends command to generate package.json instead of package-info.json, because otherwise, I receive an error that 'package.json' was not found.