feat(dataZoom): allow customizing borderRadius of the move handle

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

1. Add a new option borderRadius for moveHandleStyle to allow customizing the border radius of the move handle

2. Fix a bug that the datazoom shadow may overflow when borderRadius is set.

Before	After

Fixed issues

• Resolves [Feature] Expose moveHandle (dataZoom) radius option to chart options #18958

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

Please refer to the above demos or test/dataZoom-clip.html.

Others

Merging options

• Please squash the commits into a single one when merging.

Other information

[echarts-bot]

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Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the PR: awaiting doc label.

[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-18959@7edbe94

[er-ant]

Hey guys any updates on this config so much? We would like to have this, very usefull for better UX for our users! Thanks in advance