fix(directory-tree): expose scrollTo method.

[zhi-zhi-zhi]

This is a ...

• Bug fix

What's the background?

1. Describe the source of requirement.
   Directory-tree's scrollTo method is missing.
2. Resolve what problem.
   This PR is expose scrollTo method to fix the above problem.
3. Related issue link.
   Directory tree doesn't have scrollTo method. #6064

API Realization (Optional if not new feature)

1. Basic thought of solution and other optional proposal.
   Add scrollTo method in Directory-Tree setup expose.
2. List final API realization and usage sample.
   Like documentation.
3. GIF or snapshot should be provided if includes UI/interactive modification.
   None.

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

1. Does this PR affect user? Which part will be affected?
   None.
2. What will say in changelog?
   Fix the problem that Directory-tree's scrollTo method is missing.
3. Does this PR contains potential break change or other risk?
   None

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)

If this PR related with other PR or following info. You can type here.
None

[github-actions]

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