Make line height configurable

### Description

Similar to other editors, allow the option to specify the line height to control how separated lines look from each other.

### Use case/motivation

Using some modern fonts like [monaspace](https://monaspace.githubnext.com/#learn-more), consecutive lines look two close together, producing a hard to read block of text.

### Related issues

_No response_

### Are you willing to submit a pull request?

No

The issue names no files, tests, or entry points. Start by locating NetBeans' editor settings and line-rendering configuration, then clarify where line height should be configured and how the completed option should affect consecutive lines.

Written by the indexing model from the issue text.