Pass userTyping to custom formatter of InputNumber

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

Since the recent rewrite of InputNumber, which basically ignores the precision prop when there is a custom formatter, it is important to allow such custom formatter to fully replicate the precision logic. This requires that userTyping is passed down to said custom formatter. Whilst migrating to a new version of ant-design, one of my tests is breaking due to this change, and I cannot see any easy solution around it (apart from this feature request).

Reproduction: codesandbox

The reproduction very simply tries to imitate the precision prop functionality with a custom formatter. The moment a user types a value, the input automatically adds the precision and moves the cursor, making the input unusable. The custom formatter would need userTyping to prevent that from happening (+ some other situations).

What does the proposed API look like?

Pass userTyping to any custom formatter of the InputNumber component.

[shaodahong]

I like formatter(text: string, info: { userTyping: boolean }).

[xrkffgg]

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