`maxlength` for `TextArea` tag

**Is your feature request related to a problem? Please describe.**
- I want to have a input length limit for `TextArea` tag.

**Describe the solution you'd like**
- Having a parameter `maxlength` as in HTML for `TextArea` tag.

**Describe alternatives you've considered**
- This can be done with JavaScript, but I wasn't sure how to include a custom script within Label Studio.

**Additional context**
- This feature is useful when you want to limit the max length of user input, for example, when you annotate for summarization.