fix(type): markLine symbolOffset can be a 2d array for both symbols

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Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Add missing 2d array type for markLine.symbolOffset

Fixed issues

• Resolves [Bug] Markline symbolOffset array value does not work #20483

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

Link

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Merging options

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

Other information

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The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-20491@421069f