Multiline Support for ix-tree-item

[marvin-grvn]

Prerequisites

• I have read the Contributing Guidelines.
• I have not leaked any internal/restricted information like screenshots, videos, code snippets, links etc.

Suggestion / feature request

ix-tree-item has a hardcoded height of 32px, which only supports single-line content.
We have a use case where tree items need to display multiple lines (e.g. name + description).
Our current custom workaround causes rendering and scrolling issues.

Request:
Add native multiline support by allowing dynamic or configurable item height so tree items can adapt to their content without layout issues.

code to reproduce current behavior: https://stackblitz.com/edit/mntxjgty?file=src%2Ftree-custom.ts