feat: support minGap cfg for autoHide overlap

[lessmost]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

axis label autoHide 支持配置最小间距:

xAxis: {
      label: {
        autoRotate: false,
        autoHide: {
          type: 'equidistance',
          cfg: {
            minGap: 6,
          },
        },
      },
    },

before	after

[lgtm-com]

This pull request introduces 1 alert and fixes 1 when merging 3d6c8cf into 10f572d - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

fixed alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert and fixes 1 when merging c8adfd2 into 10f572d - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

fixed alerts:

• 1 for Unused variable, import, function or class