[Feature]: <fluent-tree-view> should support the start/end concept that many of the other web-components do

[john-lemire]

Area

Web Components (@fluentui/web-components)

Describe the feature that you would like added

Please add the start/end slot concept that other fluentui web-components implement to the fluent-tree-view component.
It would be very helpful to be able to use these to implement things like this without messing around with css overrides.

Additional context

No response

Have you discussed this feature with our team

No response

Validations

• Check that there isn't already an issue that requests the same feature to avoid creating a duplicate.

Priority

Medium