Tree view: Option for text wrap instead of truncation

[GCHQ-Developer-299]

Summary

Provide prop for tree items that are too long to wrap instead of truncating, which is the current behaviour.

Current tree view:

Old tree view, with overflow:

💬 Description

Prop could be called "overflowBehaviour" or something

[MI6-255]

Default to text wrap onto the next line, and a prop added to truncate. Option to have it at the tree view level and at a per item level

[MI6-255]

Add a guidance code example