React-big-calendar: Request api for onMouseOver event

[rockcs1992]

Do you want to request a _feature_ or report a _bug_?

request a feature

What's the current behavior?

when use the mouse to hover over an event, there is no api interface for adding a onMouseEnter or onMouseOut event

What's the expected behavior?

Expose an API used for firing callback function when the mouse enters and leaves an event. Just like onSelectEvent, might be called something like onMouseOverEvent, onMouseLeaveEvent.

[rockcs1992]

https://github.com/intljusticemission/react-big-calendar/pull/1512

I created a small PR for the feature, please let me know how you think about this 😊

[AlbertoFardin]

I also need these events.
Please approve his PR

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mikeyyyzhao]

+1 need these events. Please approve this PR. Can we also add onMouseEnter? I only see onMouseOver and onMouseOut

[bvanhou]

+1