Use labeling engine to render linear referencing labels #58506
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This allows more efficient rendering when the document and metrics have already been calculated
Where possible, we now use the labeling engine to register and render labels from a linear referencing symbol layer. This ensures that the linear referencing labels correctly participate in the map labeling problem, including forcing other map labels to be repositioned to avoid overlaps.
affects the labeling and is re-drawn
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(temporarily includes #58484)
This PR implements the missing API bits for allowing a feature renderer/symbol/symbol layer to interact with the labeling engine, and inject labels into the map. The end result is that labels formed from the linear referencing symbol layer will now participate in the map labeling problem, and eg cause other labels to shift placement to avoid overlaps.
(The same approach could be used in future to improve the point displacement label rendering)
Sponsored by the Swiss QGIS User Group