fix(types): fix types of event handlers #1915

[choyongjoon]

Fixes #1915

Description

Search all cases in all index.d.ts files through this regex:

event: React\.(.*)EventHandler

and replace with this regex:

event: React.$1Event

Scope

• Patch: Bug Fix
• Minor: New Feature
• Major: Breaking Change

[CLAassistant]

All committers have signed the CLA.

[restrin-extensis]

ButtonProps, too.

onClick?: (event: React.MouseEventHandler<HTMLButtonElement>) => any;