fix: axisLabel.formatter does not receive indexes when using customValues

[szymonpachucki]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Now we can use indexes of custom values in formatter of axisLabel.

Fixed issues

[<!--

• [Bug] axisLabel.formatter function (value, index) doesn't receive index numbers when using customValues #21216:
  -->]

Details

We were not passing indexes to labelFormatter so when trying to use them in custom formatter we were just getting undefined.

Before: What was the problem?

On demo provided in the issue nothing would load due to using undefined in indexing.

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
• 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!
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[Ovilia]

The code changes looks good to me. Thanks! Please add a test case in test/axisLabel.html.

[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-21220@792ce90