feat: add event update:expandedRowKeys for Table

[viruscamp]

It's same as event expandedRowsChange, but can be used with prop as :expandedRowKeys.sync="expandedRowKeys" for short.

This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

1. Describe the source of requirement.
2. Resolve what problem.
3. Related issue link.

API Realization (Optional if not new feature)

1. Basic thought of solution and other optional proposal.
   Add the new event update:expandedRowKeys, and keep expandedRowsChange unchange for compatibility.
   So we can use :expandedRowKeys.sync="expandedRowKeys".
2. List final API realization and usage sample.
3. GIF or snapshot should be provided if includes UI/interactive modification.

What's the effect? (Optional if not new feature)

1. Does this PR affect user? Which part will be affected?
2. What will say in changelog?
3. Does this PR contains potential break change or other risk?

Changelog description (Optional if not new feature)

1. English description
2. Chinese description (optional)

Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

Additional Plan? (Optional if not new feature)

Find other props can be used with events update:xx, and add the events.
First in Table and Table.Column, later in other components.

If this PR related with other PR or following info. You can type here.

[tangjinzhou]

can you pr this to 1.x branch?
Thanks

[github-actions]

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