feat(treemap): support customizing cursor for items

[adaelixir]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Adding custom cursor properties for Treemap

Fixed issues

• Can maps support custom cursor style? #13632

Details

Before: What was the problem?

In treemap, there is no way to customize the cursor style through cursor, and it can only default to "pointer"

After: How does it behave after the fixing?

Users can set the cursor style in option like other series graph

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

N.A.

Others

Merging options

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

Other information

[echarts-bot]

Thanks for your contribution!
The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

[plainheart]

Hi, thanks for your contribution! Please remove the dist files.