feat: Add stripAll and fix strip issue

[bourne7]

Current codes：

1. wrap and unwrap method will remove chars in pair.
2. strip will remove chars once

In this PR:

1. add stripAll method to remove all prefixes and suffixes.
2. fix a bug:

   Assert.assertEquals("", CharSequenceUtil.strip("a", "a", "a"))

   In current version CharSequenceUtil.strip("a", "a", "a") will return "a".

[looly]

记得下次提交到v5-dev分支。

[looly]

这个PR冲突了，我手动合并吧~~

[bourne7]

好的老哥😁