Request for Multiline Input Support in <nb-chat-from> Component

### Issue type

**I'm submitting a ...** (check one with "x")

* [ ] bug report
* [x] feature request

### Issue description
I would like to request the addition of multiline input support for the component. Currently, the component only allows for single-line input, which can be limiting in various use cases.

**Current behavior:**

**Expected behavior:**
I propose adding support for multiline input in the component. This enhancement would allow users to input messages spanning multiple lines, facilitating more detailed communication within the chat interface.