feat(time): add meridian template {a}/{A}

[maurodesouza]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

I added a meridian template to the time format.

Fixed issues

Details

Before: What was the problem?

There wasn't a template to show the meridian.

After: How does it behave after the fixing?

Now it's possible to use the template {a} | {A} to show the meridian on the time formatting

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.

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]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19888@96f4a5f

[echarts-bot]

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

[bhavishyachandra]

Thanks for the contribution @maurodesouza! I've waited a long time for this one.
@plainheart any idea when you plan on releasing 5.5.1?