JS: Add textbox module

[Willy-JL]

What's new

• JS API for textbox module
• #3586

Verification

• Apps > Scripts > textbox.js

Checklist (For Reviewer)

• [ ] PR has description of feature/bug or link to Confluence/Jira task
• [ ] Description contains actions to verify feature/bugfix
• [ ] I've built this code, uploaded it to the device and verified feature/bugfix

[Willy-JL]

First thing I thought was to use view holder actually, but then noticed it's not exposed, glad to see it in public api )

[nminaylov]

Yeah, we forgot to include it in API for some reason