perf(line): reduce runtime memory cost

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Prebind the context of the _changePolyState function to the current instance of LineView rather than create a new function to reduce runtime memory cost.

Fixed issues

• Resolves [Bug] Echart setoption内存会随时间增长且无法回收（必现） #20151

Details

Before	After

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

See the online demo

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.

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

[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-20161@86db174

[linghaoSu]

对比确实相比较之前几乎不再增长

PS： resize 之后也会释放原本占用的空间这个和这个有什么关联么（视频拖动分割线时，右侧代表内存占用的蓝色突然消失）

default.mov

[100pah]

Just some extra records of this case:

It seems to be caused by:

        const oldData = this._data;
        // ...
        const changePolyState = (toState: DisplayState) => {
            this._changePolyState(toState);
        };
        data.eachItemGraphicEl(function (el) {
            el && ((el as ECElement).onHoverStateChange = changePolyState);
        });

A closure of changePolyState references to oldData, and oldData references to the previous changePolyStates.
As a result, all of the oldDatas are not released.

---

TODO: need to check whether is kind of case occurs in other render functions that contain oldData and element listener.

[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍