enhance handleRemove in Upload

[shlice]

What problem does this feature solve?

onRemove will be executed when removing file button is clicked, remove event will be prevented when return value is false.

But, if we want't to popup a confirm dialog, it can't block the execution of onRemove.
So, I add Promise support for onRemove. The return value of onRemove now can be a Promise, and the handleRemove function in Upload can wait for the non-blocking confirm dialog.

What does the proposed API look like?

Example:

onRemove for Upload

onRemove: file => {
    return new Promise((resolve, reject) => {
        confirm({
            title: 'are you sure to remove this file?',
            onOk: () => {
                resolve(true)
            },
        })
    })
}

[lock]

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