新功能建议：增加注释折叠功能

[catsalt]

Please answer these questions before submitting your issue. Thanks! Please download LiteIDE latest version and test before submitting your issue. Thanks!

What version of LiteIDE are you using (LiteIDE About - Version and Build Qt Version)?

3.74 qt5.14.2

What version of Go are you using (go version)?

Go 1.16

What operating system and processor architecture are you using(go env)?

Win10 x86； Kylin arm64；

What did you do?

If possible, provide a recipe for reproducing the error.

What did you expect to see?

代码和注释都能折叠。

What did you see instead?

代码注释部分如果很多的时候， 代码折叠了，注释却有很多。