feat: matrix coordinate

[Ovilia]

Brief Information

This pull request is in the type of:

• [ ] bug fixing
• [x] new feature
• [ ] others

What does this PR do?

This PR introduces a new coordinate called "Matrix".

Multiple series like heatmap, pie, graph, custom can be used along with it.

More applications:

Fixed issues

Details

Before: What was the problem?

After: How does it behave after the fixing?

Document Info

One of the following should be checked.

• [ ] This PR doesn't relate to document changes
• [ ] The document should be updated later
• [x] The document changes have been made in apache/echarts-doc#394 and apache/echarts-examples#90

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[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.

The pull request is marked to be PR: author is committer because you are a committer of this project.

⚠️ MISSING DOCUMENT INFO: Please make sure one of the document options are checked in this PR's description. Search "Document Info" in the description of this PR. This should be done either by the author or the reviewers of the PR.

[echarts-bot[bot]]

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[bot]]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19807@31295e1