fix(comp:carousel): pre and next arrow should hide when item count is 0

[sallerli1]

PR Checklist

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• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added/updated or not needed
• [x] Docs and demo have been added/updated or not needed

What is the current behavior?

Carousel的item 数量只有一个的时候，next,pre,goto的跳转调用，会触发切换动画，但实际上没有可切换的内容

What is the new behavior?

1. 当item数量只有一个的时候，切换的调用不应该执行
2. 当item数量只有一个的时候，切换的箭头按钮不应该显示

Other information

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.79%. Comparing base (49eb4ea) to head (2643b12).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1871 +/- ## ======================================= Coverage 90.79% 90.79% ======================================= Files 359 359 Lines 35225 35225 Branches 2805 2805 ======================================= Hits 31981 31981 Misses 3244 3244 ```

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