feat: support expand all control in expandable column header

[nikzanda]

Summary

Add an opt-in expand/collapse-all control to the expandable column header.

This is intended to support the use case described in ant-design/ant-design#8791.

The PR is opened as a draft to confirm the API shape before preparing the corresponding Ant Design integration.

API

• Add expandable.showExpandAll to enable the header control.
• Add expandable.expandAllIcon to customize its rendering.
• Add expandable.onExpandAll to observe expand/collapse-all actions.
• Allow expandable.columnTitle to be a render function receiving the generated expand-all control.

Behavior

• The feature is disabled by default.
• Only rows allowed by rowExpandable are affected.
• Controlled and uncontrolled expandedRowKeys are supported.
• Existing unrelated expanded keys are preserved.
• Both the default and custom expand-all icons are supported.
• The control is currently limited to expandedRowRender tables.

Testing

Added regression coverage for:

• opt-in rendering
• expanding and collapsing all rows
• rowExpandable filtering
• controlled expandedRowKeys
• preservation of unrelated expanded keys
• custom expandAllIcon
• composition through columnTitle

Validation:

• yarn test tests/ExpandRow.spec.jsx
• yarn tsc
• yarn lint

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[nikzanda]

@afc163, when you have time, could you please take a quick look at the proposed API (showExpandAll, expandAllIcon, onExpandAll, and the columnTitle render function)?

I opened this as a draft to confirm the API direction before preparing the corresponding Ant Design integration for ant-design/ant-design#8791. Thanks!