[annotations] Add linked layer option for annotation layers (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#58287
Author: @nyalldawson
QGIS version: 3.40

[annotations] Add linked layer option for annotation layers

PR Description:

Adds a new "Linked layer" setting to the render page for annotation layers, which allows users to optionally set a linked visibility layer for the annotation layer. If set, then the annotations will only be drawn when the linked layer is visible in the map.

This is designed to mimic the similar linked layer option for the older annotation framework, in order to close the feature gap between old vs new annotations

Refs qgis/QGIS-Enhancement-Proposals#269

Commits tagged with [need-docs] or [FEATURE]